added day 3 translation and fixed folder names in portuguese

2 years ago · e68b826198
parent 54d1b87e66
commit e68b826198
39 changed files with 652 additions and 287 deletions
--- a/Portuguese/02_Day_Data_types/day_1_2.png
+++ b/Portuguese/02_Day_Data_types/day_1_2.png
--- a/Portuguese/02_Day_Data_types/math_object.js
+++ b/Portuguese/02_Day_Data_types/math_object.js
@ -1,34 +0,0 @@
 const PI = Math.PI
 console.log(PI) // 3.141592653589793
 console.log(Math.round(PI)) // 3; to round values to the nearest number
 console.log(Math.round(9.81)) // 10
 console.log(Math.floor(PI)) // 3; rounding down
 console.log(Math.ceil(PI)) // 4; rounding up
 console.log(Math.min(-5, 3, 20, 4, 5, 10)) // -5, returns the minimum value
 console.log(Math.max(-5, 3, 20, 4, 5, 10)) // 20, returns the maximum value
 const randNum = Math.random() // creates random number between 0 to 0.999999
 console.log(randNum)
 // Let create random number between 0 to 10
 const num = Math.floor(Math.random() * 11) // creates random number between 0 and 10
 console.log(num)
 //Absolute value
 console.log(Math.abs(-10)) //10
 //Square root
 console.log(Math.sqrt(100)) // 10
 console.log(Math.sqrt(2)) //1.4142135623730951
 // Power
 console.log(Math.pow(3, 2)) // 9
 console.log(Math.E) // 2.718
 // Logarithm
 //Returns the natural logarithm of base E of x, Math.log(x)
 console.log(Math.log(2)) // 0.6931471805599453
 console.log(Math.log(10)) // 2.302585092994046
 // Trigonometry
 console.log(Math.sin(0))
 console.log(Math.sin(60))
 console.log(Math.cos(0))
 console.log(Math.cos(60))
--- a/Portuguese/02_Day_Data_types/non_primitive_data_types.js
+++ b/Portuguese/02_Day_Data_types/non_primitive_data_types.js
@ -1,30 +0,0 @@
 let nums = [1, 2, 3]
 nums[0] = 10
 console.log(nums) // [10, 2, 3]
 let nums = [1, 2, 3]
 let numbers = [1, 2, 3]
 console.log(nums == numbers) // false
 let userOne = {
  name: 'Asabeneh',
  role: 'teaching',
  country: 'Finland'
 }
 let userTwo = {
  name: 'Asabeneh',
  role: 'teaching',
  country: 'Finland'
 }
 console.log(userOne == userTwo) // false
 let numbers = nums
 console.log(nums == numbers)  // true
 let userOne = {
 name:'Asabeneh',
 role:'teaching',
 country:'Finland'
 }
 let userTwo = userOne
 console.log(userOne == userTwo)  // true
--- a/Portuguese/02_Day_Data_types/number_data_types.js
+++ b/Portuguese/02_Day_Data_types/number_data_types.js
@ -1,9 +0,0 @@
 let age = 35
 const gravity = 9.81 //we use const for non-changing values, gravitational constant in  m/s2
 let mass = 72 // mass in Kilogram
 const PI = 3.14 // pi a geometrical constant
 //More Examples
 const boilingPoint = 100 // temperature in oC, boiling point of water which is a constant
 const bodyTemp = 37 // oC average human body temperature, which is a constant
 console.log(age, gravity, mass, PI, boilingPoint, bodyTemp)
--- a/Portuguese/02_Day_Data_types/primitive_data_types.js
+++ b/Portuguese/02_Day_Data_types/primitive_data_types.js
@ -1,14 +0,0 @@
 let word = 'JavaScript'
 // we dont' modify string 
 // we don't do like this, word[0] = 'Y' 
 let numOne = 3
 let numTwo = 3
 console.log(numOne == numTwo)      // true
 let js = 'JavaScript'
 let py = 'Python'
 console.log(js == py)             //false 
 let lightOn = true
 let lightOff = false
 console.log(lightOn == lightOff) // false
--- a/Portuguese/02_Day_Data_types/string_concatenation.js
+++ b/Portuguese/02_Day_Data_types/string_concatenation.js
@ -1,19 +0,0 @@
 // Declaring different variables of different data types
 let space = ' '
 let firstName = 'Asabeneh'
 let lastName = 'Yetayeh'
 let country = 'Finland'
 let city = 'Helsinki'
 let language = 'JavaScript'
 let job = 'teacher'
 // Concatenating using addition operator
 let fullName = firstName + space + lastName // concatenation, merging two string together.
 console.log(fullName)
 let personInfoOne = fullName + '. I am ' + age + '. I live in ' + country // ES5
 console.log(personInfoOne)
 // Concatenation: Template Literals(Template Strings)
 let personInfoTwo = `I am ${fullName}. I am ${age}. I live in ${country}.` //ES6 - String interpolation method
 let personInfoThree = `I am ${fullName}. I live in ${city}, ${country}. I am a ${job}. I teach ${language}.`
 console.log(personInfoTwo)
 console.log(personInfoThree)
--- a/Portuguese/02_Day_Data_types/string_data_types.js
+++ b/Portuguese/02_Day_Data_types/string_data_types.js
@ -1,7 +0,0 @@
 let space = ' ' // an empty space string
 let firstName = 'Asabeneh'
 let lastName = 'Yetayeh'
 let country = 'Finland'
 let city = 'Helsinki'
 let language = 'JavaScript'
 let job = 'teacher'
--- a/Portuguese/02_Day_Data_types/string_methods/accessing_character.js
+++ b/Portuguese/02_Day_Data_types/string_methods/accessing_character.js
@ -1,12 +0,0 @@
 // Let us access the first character in 'JavaScript' string.
 let string = 'JavaScript'
 let firstLetter = string[0]
 console.log(firstLetter) // J
 let secondLetter = string[1] // a
 let thirdLetter = string[2]
 let lastLetter = string[9]
 console.log(lastLetter) // t
 let lastIndex = string.length - 1
 console.log(lastIndex) // 9
 console.log(string[lastIndex]) // t
--- a/Portuguese/02_Day_Data_types/string_methods/char_at.js
+++ b/Portuguese/02_Day_Data_types/string_methods/char_at.js
@ -1,6 +0,0 @@
 // charAt(): Takes index and it returns the value at that index
 string.charAt(index)
 let string = '30 Days Of JavaScript'
 console.log(string.charAt(0)) // 3
 let lastIndex = string.length - 1
 console.log(string.charAt(lastIndex)) // t
--- a/Portuguese/02_Day_Data_types/string_methods/char_code_at.js
+++ b/Portuguese/02_Day_Data_types/string_methods/char_code_at.js
@ -1,7 +0,0 @@
 // charCodeAt(): Takes index and it returns char code(ASCII number) of the value at that index
 string.charCodeAt(index)
 let string = '30 Days Of JavaScript'
 console.log(string.charCodeAt(3)) // D ASCII number is 51
 let lastIndex = string.length - 1
 console.log(string.charCodeAt(lastIndex)) // t ASCII is 116
--- a/Portuguese/02_Day_Data_types/string_methods/concat.js
+++ b/Portuguese/02_Day_Data_types/string_methods/concat.js
@ -1,6 +0,0 @@
 // concat(): it takes many substrings and creates concatenation.
 // string.concat(substring, substring, substring)
 let string = '30'
 console.log(string.concat("Days", "Of", "JavaScript")) // 30DaysOfJavaScript
 let country = 'Fin'
 console.log(country.concat("land")) // Finland
--- a/Portuguese/02_Day_Data_types/string_methods/ends_with.js
+++ b/Portuguese/02_Day_Data_types/string_methods/ends_with.js
@ -1,11 +0,0 @@
 // endsWith: it takes a substring as an argument and it checks if the string starts with that specified substring. It returns a boolean(true or false).
 // string.endsWith(substring)
 let string = 'Love is the best to in this world'
 console.log(string.endsWith('world')) // true
 console.log(string.endsWith('love')) // false
 console.log(string.endsWith('in this world')) // true
 let country = 'Finland'
 console.log(country.endsWith('land')) // true
 console.log(country.endsWith('fin')) // false
 console.log(country.endsWith('Fin')) //  false
--- a/Portuguese/02_Day_Data_types/string_methods/includes.js
+++ b/Portuguese/02_Day_Data_types/string_methods/includes.js
@ -1,14 +0,0 @@
 // includes(): It takes a substring argument and it check if substring argument exists in the string. includes() returns a boolean. It checks if a substring exist in a string and it returns true if it exists and false if it doesn't exist.
 let string = '30 Days Of JavaScript'
 console.log(string.includes('Days'))     // true
 console.log(string.includes('days'))     // false
 console.log(string.includes('Script'))     // true
 console.log(string.includes('script'))     // false
 console.log(string.includes('java'))     // false
 console.log(string.includes('Java'))     // true
 let country = 'Finland'
 console.log(country.includes('fin')) // false
 console.log(country.includes('Fin')) // true
 console.log(country.includes('land')) // true
 console.log(country.includes('Land')) // false
--- a/Portuguese/02_Day_Data_types/string_methods/index_of.js
+++ b/Portuguese/02_Day_Data_types/string_methods/index_of.js
@ -1,11 +0,0 @@
 // indexOf(): Takes takes a substring and if the substring exists in a string it returns the first position of the substring if does not exist it returns -1
 string.indexOf(substring)
 let string = '30 Days Of JavaScript'
 console.log(string.indexOf('D'))          // 3
 console.log(string.indexOf('Days'))       // 3
 console.log(string.indexOf('days'))       // -1
 console.log(string.indexOf('a'))          // 4
 console.log(string.indexOf('JavaScript')) // 11
 console.log(string.indexOf('Script'))     //15
 console.log(string.indexOf('script'))     // -1
--- a/Portuguese/02_Day_Data_types/string_methods/last_index_of.js
+++ b/Portuguese/02_Day_Data_types/string_methods/last_index_of.js
@ -1,6 +0,0 @@
 // lastIndexOf(): Takes takes a substring and if the substring exists in a string it returns the last position of the substring if it does not exist it returns -1
 let string = 'I love JavaScript. If you do not love JavaScript what else can you love.'
 console.log(string.lastIndexOf('love'))       // 67
 console.log(string.lastIndexOf('you'))        // 63
 console.log(string.lastIndexOf('JavaScript')) // 38
--- a/Portuguese/02_Day_Data_types/string_methods/length.js
+++ b/Portuguese/02_Day_Data_types/string_methods/length.js
@ -1,6 +0,0 @@
 // length: The string length method returns the number of characters in a string included empty space. Example:
 let js = 'JavaScript'
 console.log(js.length)        // 10
 let firstName = 'Asabeneh'
 console.log(firstName.length) // 8
--- a/Portuguese/02_Day_Data_types/string_methods/match.js
+++ b/Portuguese/02_Day_Data_types/string_methods/match.js
@ -1,22 +0,0 @@
 // match: it takes a substring or regular expression pattern as an argument and it returns an array if there is match if not it returns null. Let us see how a regular expression pattern looks like. It starts with / sign and ends with / sign.
 let string = 'love'
 let patternOne = /love/ // with out any flag
 let patternTwo = /love/gi // g-means to search in the whole text, i - case insensitive
 string.match(substring)
 let string = 'I love JavaScript. If you do not love JavaScript what else can you love.'
 console.log(string.match('love')) //
 /*
 output
 ["love", index: 2, input: "I love JavaScript. If you do not love JavaScript what else can you love.", groups: undefined]
 */
 let pattern = /love/gi
 console.log(string.match(pattern)) // ["love", "love", "love"]
 // Let us extract numbers from text using regular expression. This is not regular expression section, no panic.
 let txt = 'In 2019, I run 30 Days of Python. Now, in 2020 I super exited to start this challenge'
 let regEx = /\d/g // d with escape character means d not a normal d instead acts a digit
 // + means one or more digit numbers, 
 // if there is g after that it means global, search everywhere.
 console.log(txt.match(regEx)) // ["2", "0", "1", "9", "3", "0", "2", "0", "2", "0"]
 console.log(txt.match(/\d+/g)) // ["2019", "30", "2020"]
--- a/Portuguese/02_Day_Data_types/string_methods/repeat.js
+++ b/Portuguese/02_Day_Data_types/string_methods/repeat.js
@ -1,4 +0,0 @@
 // repeat(): it takes a number argument and it returned the repeated version of the string.
 // string.repeat(n)
 let string = 'love'
 console.log(string.repeat(10)) // lovelovelovelovelovelovelovelovelovelove
--- a/Portuguese/02_Day_Data_types/string_methods/replace.js
+++ b/Portuguese/02_Day_Data_types/string_methods/replace.js
@ -1,7 +0,0 @@
 // replace(): takes to parameter the old substring and new substring.
 // string.replace(oldsubstring, newsubstring)
 let string = '30 Days Of JavaScript'
 console.log(string.replace('JavaScript', 'Python')) // 30 Days Of Python
 let country = 'Finland'
 console.log(country.replace('Fin', 'Noman')) // Nomanland
--- a/Portuguese/02_Day_Data_types/string_methods/search.js
+++ b/Portuguese/02_Day_Data_types/string_methods/search.js
@ -1,4 +0,0 @@
 // search: it takes a substring as an argument and it returns the index of the first match.
 // string.search(substring)
 let string = 'I love JavaScript. If you do not love JavaScript what else can you love.'
 console.log(string.search('love')) // 2
--- a/Portuguese/02_Day_Data_types/string_methods/split.js
+++ b/Portuguese/02_Day_Data_types/string_methods/split.js
@ -1,10 +0,0 @@
 // split(): The split method splits a string at a specified place.
 let string = '30 Days Of JavaScript'
 console.log(string.split())     // ["30 Days Of JavaScript"]
 console.log(string.split(' '))  // ["30", "Days", "Of", "JavaScript"]
 let firstName = 'Asabeneh'
 console.log(firstName.split())  // ["Asabeneh"]
 console.log(firstName.split(''))  // ["A", "s", "a", "b", "e", "n", "e", "h"]
 let countries = 'Finland, Sweden, Norway, Denmark, and Iceland'
 console.log(countries.split(',')) // ["Finland", " Sweden", " Norway", " Denmark", " and Iceland"]
 console.log(countries.split(', '))   //  ["Finland", "Sweden", "Norway", "Denmark", "and Iceland"]
--- a/Portuguese/02_Day_Data_types/string_methods/starts_with.js
+++ b/Portuguese/02_Day_Data_types/string_methods/starts_with.js
@ -1,11 +0,0 @@
 // startsWith: it takes a substring as an argument and it checks if the string starts with that specified substring. It returns a boolean(true or false).
 // string.startsWith(substring)
 let string = 'Love is the best to in this world'
 console.log(string.startsWith('Love')) // true
 console.log(string.startsWith('love')) // false
 console.log(string.startsWith('world')) // false
 let country = 'Finland'
 console.log(country.startsWith('Fin')) // true
 console.log(country.startsWith('fin')) // false
 console.log(country.startsWith('land')) //  false
--- a/Portuguese/02_Day_Data_types/string_methods/substr.js
+++ b/Portuguese/02_Day_Data_types/string_methods/substr.js
@ -1,5 +0,0 @@
 //substr(): It takes two arguments,the starting index and number of characters to slice.
 let string = 'JavaScript'
 console.log(string.substr(4,6))    // Script
 let country = 'Finland'
 console.log(country.substr(3, 4))   // land
--- a/Portuguese/02_Day_Data_types/string_methods/substring.js
+++ b/Portuguese/02_Day_Data_types/string_methods/substring.js
@ -1,9 +0,0 @@
 // substring(): It takes two arguments,the starting index and the stopping index but it doesn't include the stopping index.
 let string = 'JavaScript'
 console.log(string.substring(0,4))   // Java
 console.log(string.substring(4,10))     // Script
 console.log(string.substring(4))    // Script
 let country = 'Finland'
 console.log(country.substring(0, 3))   // Fin
 console.log(country.substring(3, 7))   // land
 console.log(country.substring(3))   // land
--- a/Portuguese/02_Day_Data_types/string_methods/to_lowercase.js
+++ b/Portuguese/02_Day_Data_types/string_methods/to_lowercase.js
@ -1,7 +0,0 @@
 // toLowerCase(): this method changes the string to lowercase letters.
 let string = 'JavasCript'
 console.log(string.toLowerCase())     // javascript
 let firstName = 'Asabeneh'
 console.log(firstName.toLowerCase())  // asabeneh
 let country = 'Finland'
 console.log(country.toLowerCase())   // finland
--- a/Portuguese/02_Day_Data_types/string_methods/to_uppercase.js
+++ b/Portuguese/02_Day_Data_types/string_methods/to_uppercase.js
@ -1,8 +0,0 @@
 // toUpperCase(): this method changes the string to uppercase letters.
 let string = 'JavaScript'
 console.log(string.toUpperCase())      // JAVASCRIPT
 let firstName = 'Asabeneh'
 console.log(firstName.toUpperCase())  // ASABENEH
 let country = 'Finland'
 console.log(country.toUpperCase())    // FINLAND
--- a/Portuguese/02_Day_Data_types/string_methods/trim.js
+++ b/Portuguese/02_Day_Data_types/string_methods/trim.js
@ -1,7 +0,0 @@
 //trim(): Removes trailing space in the beginning or the end of a string.
 let string = '   30 Days Of JavaScript   '
 console.log(string)     // 
 console.log(string.trim(' '))  // 
 let firstName = ' Asabeneh '
 console.log(firstName)
 console.log(firstName.trim())  // 
--- a/Portuguese/Dia_01_introdução/01_day_starter/helloworld.js
+++ b/Portuguese/Dia_01_introdução/01_day_starter/helloworld.js
--- a/Portuguese/Dia_01_introdução/01_day_starter/index.html
+++ b/Portuguese/Dia_01_introdução/01_day_starter/index.html
--- a/Portuguese/Dia_01_introdução/01_day_starter/introduction.js
+++ b/Portuguese/Dia_01_introdução/01_day_starter/introduction.js
--- a/Portuguese/Dia_01_introdução/01_day_starter/main.js
+++ b/Portuguese/Dia_01_introdução/01_day_starter/main.js
--- a/Portuguese/Dia_01_introdução/01_day_starter/variable.js
+++ b/Portuguese/Dia_01_introdução/01_day_starter/variable.js
--- a/Portuguese/Dia_01_introdução/variable.js
+++ b/Portuguese/Dia_01_introdução/variable.js
--- a/Portuguese/Dia_02_Tipos_Dados/dia_02_starter/index.html
+++ b/Portuguese/Dia_02_Tipos_Dados/dia_02_starter/index.html
--- a/Portuguese/Dia_02_Tipos_Dados/dia_02_starter/main.js
+++ b/Portuguese/Dia_02_Tipos_Dados/dia_02_starter/main.js
--- a/Portuguese/Dia_02_Tipos_Dados/dia_02_tipos_dados.md
+++ b/Portuguese/Dia_02_Tipos_Dados/dia_02_tipos_dados.md
@ -14,7 +14,7 @@
 </div>
 </div>
-[<< Dia 1](../readMe.md) | [Dia 3 >>](../03_Day_Booleans_operators_date/03_booleans_operators_date.md)
+[<< Dia 1](../readMe.md) | [Dia 3 >>](../Dia_03_Booleanos_Operadores_Data/dia_03_booleanos_operadores_data.md)
 ![Thirty Days Of JavaScript](/images/banners/day_1_2.png)
--- a/Portuguese/Dia_03_Booleanos_Operadores_Data/03_day_starter/index.html
+++ b/Portuguese/Dia_03_Booleanos_Operadores_Data/03_day_starter/index.html
@ -0,0 +1,17 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
    <title>30DaysOfJavaScript: 03 Day</title>
 </head>
 <body>
    <h1>30DaysOfJavaScript:03 Day</h1>
    <h2>Booleans, undefined, null, date object</h2>
    <!-- import your scripts here -->
    <script src="./scripts/main.js"></script>
 </body>
 </html>
--- a/Portuguese/Dia_03_Booleanos_Operadores_Data/03_day_starter/scripts/main.js
+++ b/Portuguese/Dia_03_Booleanos_Operadores_Data/03_day_starter/scripts/main.js
@ -0,0 +1 @@
 // this is your main.js script
--- a/Portuguese/Dia_03_Booleanos_Operadores_Data/Dia_03_booleanos_operadores_data.md
+++ b/Portuguese/Dia_03_Booleanos_Operadores_Data/Dia_03_booleanos_operadores_data.md
@ -0,0 +1,633 @@
 <div align="center">
  <h1> 30 Dias De JavaScript: Boleanos, Operadores e Data</h1>
  <a class="header-badge" target="_blank" href="https://www.linkedin.com/in/asabeneh/">
  <img src="https://img.shields.io/badge/style--5eba00.svg?label=LinkedIn&logo=linkedin&style=social">
  </a>
  <a class="header-badge" target="_blank" href="https://twitter.com/Asabeneh">
  <img alt="Twitter Follow" src="https://img.shields.io/twitter/follow/asabeneh?style=social">
  </a>
  <sub>Autor;
  <a href="https://www.linkedin.com/in/asabeneh/" target="_blank">Asabeneh Yetayeh</a><br>
  <small> Janeiro, 2020</small>
  </sub>
 </div>
 [<< Day 2](../Dia_02_Tipos_Dados/dia_02_tipos_dados.md) | [Day 4 >>](../04_Day_Conditionals/04_day_conditionals.md)
 ![Thirty Days Of JavaScript](../images/banners/day_1_3.png)
 - [📔 Day 3](#-day-3)
 	- [Booleans](#booleans)
 		- [Truthy values](#truthy-values)
 		- [Falsy values](#falsy-values)
 	- [Undefined](#undefined)
 	- [Null](#null)
 	- [Operators](#operators)
 		- [Assignment operators](#assignment-operators)
 		- [Arithmetic Operators](#arithmetic-operators)
 		- [Comparison Operators](#comparison-operators)
 		- [Logical Operators](#logical-operators)
 		- [Increment Operator](#increment-operator)
 		- [Decrement Operator](#decrement-operator)
 		- [Ternary Operators](#ternary-operators)
 		- [Operator Precedence](#operator-precedence)
 	- [Window Methods](#window-methods)
 		- [Window alert() method](#window-alert-method)
 		- [Window prompt() method](#window-prompt-method)
 		- [Window confirm() method](#window-confirm-method)
 	- [Date Object](#date-object)
 		- [Creating a time object](#creating-a-time-object)
 		- [Getting full year](#getting-full-year)
 		- [Getting month](#getting-month)
 		- [Getting date](#getting-date)
 		- [Getting day](#getting-day)
 		- [Getting hours](#getting-hours)
 		- [Getting minutes](#getting-minutes)
 		- [Getting seconds](#getting-seconds)
 		- [Getting time](#getting-time)
 	- [💻 Day 3: Exercises](#-day-3-exercises)
 		- [Exercises: Level 1](#exercises-level-1)
 		- [Exercises: Level 2](#exercises-level-2)
 		- [Exercises: Level 3](#exercises-level-3)
 # 📔 Day 3
 ## Booleans
 A boolean data type represents one of the two values:_true_ or _false_. Boolean value is either true or false. The use of these data types will be clear when you start the comparison operator. Any comparisons return a boolean value which is either true or false.
 **Example: Boolean Values**
 ```js
 let isLightOn = true
 let isRaining = false
 let isHungry = false
 let isMarried = true
 let truValue = 4 > 3    // true
 let falseValue = 4 < 3  // false
 ```
 We agreed that boolean values are either true or false.
 ### Truthy values
 - All numbers(positive and negative) are truthy except zero
 - All strings are truthy except an empty string ('')
 - The boolean true
 ### Falsy values
 - 0
 - 0n
 - null
 - undefined
 - NaN
 - the boolean false
 - '', "", ``, empty string
 It is good to remember those truthy values and falsy values. In later section, we will use them with conditions to make decisions.
 ## Undefined
 If we declare a variable and if we do not assign a value, the value will be undefined. In addition to this, if a function is not returning the value, it will be undefined.
 ```js
 let firstName
 console.log(firstName) //not defined, because it is not assigned to a value yet
 ```
 ## Null
 ```js
 let empty = null
 console.log(empty) // -> null , means no value
 ```
 ## Operators
 ### Assignment operators
 An equal sign in JavaScript is an assignment operator. It uses to assign a variable.
 ```js
 let firstName = 'Asabeneh'
 let country = 'Finland'
 ```
 Assignment Operators
 ![Assignment operators](../images/assignment_operators.png)
 ### Arithmetic Operators
 Arithmetic operators are mathematical operators.
 - Addition(+): a + b
 - Subtraction(-): a - b
 - Multiplication(*): a * b
 - Division(/): a / b
 - Modulus(%): a % b
 - Exponential(**): a ** b
 ```js
 let numOne = 4
 let numTwo = 3
 let sum = numOne + numTwo
 let diff = numOne - numTwo
 let mult = numOne * numTwo
 let div = numOne / numTwo
 let remainder = numOne % numTwo
 let powerOf = numOne ** numTwo
 console.log(sum, diff, mult, div, remainder, powerOf) // 7,1,12,1.33,1, 64
 ```
 ```js
 const PI = 3.14
 let radius = 100          // length in meter
 //Let us calculate area of a circle
 const areaOfCircle = PI * radius * radius
 console.log(areaOfCircle)  //  314 m
 const gravity = 9.81      // in m/s2
 let mass = 72             // in Kilogram
 // Let us calculate weight of an object
 const weight = mass * gravity
 console.log(weight)        // 706.32 N(Newton)
 const boilingPoint = 100  // temperature in oC, boiling point of water
 const bodyTemp = 37       // body temperature in oC
 // Concatenating string with numbers using string interpolation
 /*
 The boiling point of water is 100 oC.
 Human body temperature is 37 oC.
 The gravity of earth is 9.81 m/s2.
 */
 console.log(
  `The boiling point of water is ${boilingPoint} oC.\nHuman body temperature is ${bodyTemp} oC.\nThe gravity of earth is ${gravity} m / s2.`
 )
 ```
 ### Comparison Operators
 In programming we compare values, we use comparison operators to compare two values. We check if a value is greater or less or equal to other value.
 ![Comparison Operators](../images/comparison_operators.png)
 **Example: Comparison Operators**
 ```js
 console.log(3 > 2)              // true, because 3 is greater than 2
 console.log(3 >= 2)             // true, because 3 is greater than 2
 console.log(3 < 2)              // false,  because 3 is greater than 2
 console.log(2 < 3)              // true, because 2 is less than 3
 console.log(2 <= 3)             // true, because 2 is less than 3
 console.log(3 == 2)             // false, because 3 is not equal to 2
 console.log(3 != 2)             // true, because 3 is not equal to 2
 console.log(3 == '3')           // true, compare only value
 console.log(3 === '3')          // false, compare both value and data type
 console.log(3 !== '3')          // true, compare both value and data type
 console.log(3 != 3)             // false, compare only value
 console.log(3 !== 3)            // false, compare both value and data type
 console.log(0 == false)         // true, equivalent
 console.log(0 === false)        // false, not exactly the same
 console.log(0 == '')            // true, equivalent
 console.log(0 == ' ')           // true, equivalent
 console.log(0 === '')           // false, not exactly the same
 console.log(1 == true)          // true, equivalent
 console.log(1 === true)         // false, not exactly the same
 console.log(undefined == null)  // true
 console.log(undefined === null) // false
 console.log(NaN == NaN)         // false, not equal
 console.log(NaN === NaN)        // false
 console.log(typeof NaN)         // number
 console.log('mango'.length == 'avocado'.length)  // false
 console.log('mango'.length != 'avocado'.length)  // true
 console.log('mango'.length < 'avocado'.length)   // true
 console.log('milk'.length == 'meat'.length)      // true
 console.log('milk'.length != 'meat'.length)      // false
 console.log('tomato'.length == 'potato'.length)  // true
 console.log('python'.length > 'dragon'.length)   // false
 ```
 Try to understand the above comparisons with some logic. Remembering without any logic might be difficult.
 JavaScript is somehow a wired kind of programming language. JavaScript code run and give you a result but unless you are good at it may not be the desired result.
 As rule of thumb, if a value is not true with == it will not be equal with ===. Using === is safer than using ==. The following [link](https://dorey.github.io/JavaScript-Equality-Table/) has an exhaustive list of comparison of data types.
 ### Logical Operators
 The following symbols are the common logical operators:
 &&(ampersand) , ||(pipe) and !(negation).
 The && operator gets true only if the two operands are true.
 The || operator gets true either of the operand is true.
 The ! operator negates true to false and false to true.
 ```js
 // && ampersand operator example
 const check = 4 > 3 && 10 > 5         // true && true -> true
 const check = 4 > 3 && 10 < 5         // true && false -> false
 const check = 4 < 3 && 10 < 5         // false && false -> false
 // || pipe or operator, example
 const check = 4 > 3 || 10 > 5         // true  || true -> true
 const check = 4 > 3 || 10 < 5         // true  || false -> true
 const check = 4 < 3 || 10 < 5         // false || false -> false
 //! Negation examples
 let check = 4 > 3                     // true
 let check = !(4 > 3)                  //  false
 let isLightOn = true
 let isLightOff = !isLightOn           // false
 let isMarried = !false                // true
 ```
 ### Increment Operator
 In JavaScript we use the increment operator to increase a value stored in a variable. The increment could be pre or post increment. Let us see each of them:
 1. Pre-increment
 ```js
 let count = 0
 console.log(++count)        // 1
 console.log(count)          // 1
 ```
 1. Post-increment
 ```js
 let count = 0
 console.log(count++)        // 0
 console.log(count)          // 1
 ```
 We use most of the time post-increment. At least you should remember how to use post-increment operator.
 ### Decrement Operator
 In JavaScript we use the decrement operator to decrease a value stored in a variable. The decrement could be pre or post decrement. Let us see each of them:
 1. Pre-decrement
 ```js
 let count = 0
 console.log(--count) // -1
 console.log(count)  // -1
 ```
 2. Post-decrement
 ```js
 let count = 0
 console.log(count--) // 0
 console.log(count)   // -1
 ```
 ### Ternary Operators
 Ternary operator allows to write a condition.
 Another way to write conditionals is using ternary operators. Look at the following examples:
 ```js
 let isRaining = true
 isRaining
  ? console.log('You need a rain coat.')
  : console.log('No need for a rain coat.')
 isRaining = false
 isRaining
  ? console.log('You need a rain coat.')
  : console.log('No need for a rain coat.')
 ```
 ```sh
 You need a rain coat.
 No need for a rain coat.
 ```
 ```js
 let number = 5
 number > 0
  ? console.log(`${number} is a positive number`)
  : console.log(`${number} is a negative number`)
 number = -5
 number > 0
  ? console.log(`${number} is a positive number`)
  : console.log(`${number} is a negative number`)
 ```
 ```sh
 5 is a positive number
 -5 is a negative number
 ```
 ### Operator Precedence
 I would like to recommend you to read about operator precedence from this [link](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence)
 ## Window Methods
 ### Window alert() method
 As you have seen at very beginning alert() method displays an alert box with a specified message and an OK button. It is a builtin method and it takes on argument.
 ```js
 alert(message)
 ```
 ```js
 alert('Welcome to 30DaysOfJavaScript')
 ```
 Do not use too much alert because it is destructing and annoying, use it just to test.
 ### Window prompt() method
 The window prompt methods display a prompt box with an input on your browser to take input values and the input data can be stored in a variable. The prompt() method takes two arguments. The second argument is optional.
 ```js
 prompt('required text', 'optional text')
 ```
 ```js
 let number = prompt('Enter number', 'number goes here')
 console.log(number)
 ```
 ### Window confirm() method
 The confirm() method displays a dialog box with a specified message, along with an OK and a Cancel button.
 A confirm box is often used to ask permission from a user to execute something. Window confirm() takes a string as an argument.
 Clicking the OK yields true value, whereas clicking the Cancel button yields false value.
 ```js
 const agree = confirm('Are you sure you like to delete? ')
 console.log(agree) // result will be true or false based on what you click on the dialog box
 ```
 These are not all the window methods we will have a separate section to go deep into window methods.
 ## Date Object
 Time is an important thing. We like to know the time a certain activity or event. In JavaScript current time and date is created using JavaScript Date Object. The object we create using Date object provides many methods to work with date and time.The methods we use to get date and time information from a date object values are started with a word _get_ because it provide the information.
 _getFullYear(), getMonth(), getDate(), getDay(), getHours(), getMinutes, getSeconds(), getMilliseconds(), getTime(), getDay()_
 ![Date time Object](../images/date_time_object.png)
 ### Creating a time object
 Once we create time object. The time object will provide information about time. Let us create a time object
 ```js
 const now = new Date()
 console.log(now) // Sat Jan 04 2020 00:56:41 GMT+0200 (Eastern European Standard Time)
 ```
 We have created a time object and we can access any date time information from the object using the get methods we have mentioned on the table.
 ### Getting full year
 Let's extract or get the full year from a time object.
 ```js
 const now = new Date()
 console.log(now.getFullYear()) // 2020
 ```
 ### Getting month
 Let's extract or get the month from a time object.
 ```js
 const now = new Date()
 console.log(now.getMonth()) // 0, because the month is January,  month(0-11)
 ```
 ### Getting date
 Let's extract or get the date of the month from a time object.
 ```js
 const now = new Date()
 console.log(now.getDate()) // 4, because the day of the month is 4th,  day(1-31)
 ```
 ### Getting day
 Let's extract or get the day of the week from a time object.
 ```js
 const now = new Date()
 console.log(now.getDay()) // 6, because the day is Saturday which is the 7th day
 //  Sunday is 0, Monday is 1 and Saturday is 6
 // Getting the weekday as a number (0-6)
 ```
 ### Getting hours
 Let's extract or get the hours from a time object.
 ```js
 const now = new Date()
 console.log(now.getHours()) // 0, because the time is 00:56:41
 ```
 ### Getting minutes
 Let's extract or get the minutes from a time object.
 ```js
 const now = new Date()
 console.log(now.getMinutes()) // 56, because the time is 00:56:41
 ```
 ### Getting seconds
 Let's extract or get the seconds from a time object.
 ```js
 const now = new Date()
 console.log(now.getSeconds()) // 41, because the time is 00:56:41
 ```
 ### Getting time
 This method give time in milliseconds starting from January 1, 1970. It is also know as Unix time. We can get the unix time in two ways:
 1. Using _getTime()_
 ```js
 const now = new Date() //
 console.log(now.getTime()) // 1578092201341, this is the number of seconds passed from January 1, 1970 to January 4, 2020 00:56:41
 ```
 1. Using _Date.now()_
 ```js
 const allSeconds = Date.now() //
 console.log(allSeconds) // 1578092201341, this is the number of seconds passed from January 1, 1970 to January 4, 2020 00:56:41
 const timeInSeconds = new Date().getTime()
 console.log(allSeconds == timeInSeconds) // true
 ```
 Let us format these values to a human readable time format.
 **Example:**
 ```js
 const now = new Date()
 const year = now.getFullYear() // return year
 const month = now.getMonth() + 1 // return month(0 - 11)
 const date = now.getDate() // return date (1 - 31)
 const hours = now.getHours() // return number (0 - 23)
 const minutes = now.getMinutes() // return number (0 -59)
 console.log(`${date}/${month}/${year} ${hours}:${minutes}`) // 4/1/2020 0:56
 ```
 🌕  You have boundless energy. You have just completed day 3 challenges and you are three steps a head in to your way to greatness. Now do some exercises for your brain and for your muscle.
 ## 💻 Day 3: Exercises
 ### Exercises: Level 1
 1. Declare firstName, lastName, country, city, age, isMarried, year variable and assign value to it and use the typeof operator to check different data types.
 2. Check if type of '10' is equal to 10
 3. Check if parseInt('9.8') is equal to 10
 4. Boolean value is either true or false.
   1. Write three JavaScript statement which provide truthy value.
   2. Write three JavaScript statement which provide falsy value.
 5. Figure out the result of the following comparison expression first without using console.log(). After you decide the result confirm it using console.log()
   1. 4 > 3
   2. 4 >= 3
   3. 4 < 3
   4. 4 <= 3
   5. 4 == 4
   6. 4 === 4
   7. 4 != 4
   8. 4 !== 4
   9. 4 != '4'
   10. 4 == '4'
   11. 4 === '4'
   12. Find the length of python and jargon and make a falsy comparison statement.
 6. Figure out the result of the following expressions first without using console.log(). After you decide the result confirm it by using console.log()
   1. 4 > 3 && 10 < 12
   2. 4 > 3 && 10 > 12
   3. 4 > 3 || 10 < 12
   4. 4 > 3 || 10 > 12
   5. !(4 > 3)
   6. !(4 < 3)
   7. !(false)
   8. !(4 > 3 && 10 < 12)
   9. !(4 > 3 && 10 > 12)
   10. !(4 === '4')
   11. There is no 'on' in both dragon and python
 7. Use the Date object to do the following activities
   1. What is the year today?
   2. What is the month today as a number?
   3. What is the date today?
   4. What is the day today as a number?
   5. What is the hours now?
   6. What is the minutes now?
   7. Find out the numbers of seconds elapsed from January 1, 1970 to now.
 ### Exercises: Level 2
 1. Write a script that prompt the user to enter base and height of the triangle and calculate an area of a triangle (area = 0.5 x b x h).
   ```sh
   Enter base: 20
   Enter height: 10
   The area of the triangle is 100
   ```
 1. Write a script that prompt the user to enter side a, side b, and side c of the triangle and and calculate the perimeter of triangle (perimeter = a + b + c)
   ```sh
   Enter side a: 5
   Enter side b: 4
   Enter side c: 3
   The perimeter of the triangle is 12
   ```
 1. Get length and width using prompt and calculate an area of rectangle (area = length x width and the perimeter of rectangle (perimeter = 2 x (length + width))
 1. Get radius using prompt and calculate the area of a circle (area = pi x r x r) and circumference of a circle(c = 2 x pi x r) where pi = 3.14.
 1. Calculate the slope, x-intercept and y-intercept of y = 2x -2
 1. Slope is m = (y<sub>2</sub>-y<sub>1</sub>)/(x<sub>2</sub>-x<sub>1</sub>). Find the slope between point (2, 2) and point(6,10)
 1. Compare the slope of above two questions.
 1. Calculate the value of y (y = x<sup>2</sup> + 6x + 9). Try to use different x values and figure out at what x value y is 0.
 1. Writ a script that prompt a user to enter hours and rate per hour. Calculate pay of the person?
    ```sh
    Enter hours: 40
    Enter rate per hour: 28
    Your weekly earning is 1120
    ```
 1. If the length of your name is greater than 7 say, your name is long else say your name is short.
 1. Compare your first name length and your family name length and you should get this output.
    ```js
    let firstName = 'Asabeneh'
    let lastName = 'Yetayeh'
    ```
    ```sh
    Your first name, Asabeneh is longer than your family name, Yetayeh
    ```
 1. Declare two variables _myAge_ and _yourAge_ and assign them initial values and myAge and yourAge.
   ```js
   let myAge = 250
   let yourAge = 25
   ```
   ```sh
   I am 225 years older than you.
   ```
 1. Using prompt get the year the user was born and if the user is 18 or above allow the user to drive if not tell the user to wait a certain amount of years.
    ```sh
    Enter birth year: 1995
    You are 25. You are old enough to drive
    Enter birth year: 2005
    You are 15. You will be allowed to drive after 3 years.
    ```
 1. Write a script that prompt the user to enter number of years. Calculate the number of seconds a person can live. Assume some one lives just hundred years
   ```sh
   Enter number of years you live: 100
   You lived 3153600000 seconds.
   ```
 1. Create a human readable time format using the Date time object
   1. YYYY-MM-DD HH:mm
   2. DD-MM-YYYY HH:mm
   3. DD/MM/YYYY HH:mm
 ### Exercises: Level 3
 1. Create a human readable time format using the Date time object. The hour and the minute should be all the time two digits(7 hours should be 07 and 5 minutes should be 05 )
   1. YYY-MM-DD HH:mm eg. 20120-01-02 07:05
 [<< Day 2](../02_Day_Data_types/02_day_data_types.md) | [Day 4 >>](../04_Day_Conditionals/04_day_conditionals.md)