content restructured

02_Day/02_day_data_types.md

@@ -74,14 +74,17 @@ Primitive data types are compared by its values. Let us compare different data v
 ```js
 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
 ```
 
@@ -93,6 +96,7 @@ Let us see by creating an array. An array is a list of data values in a square b
 ```js
 let nums = [1, 2, 3]
 nums[0] = 10
+
 console.log(nums)  // [10, 2, 3]
 ```
 
@@ -101,6 +105,7 @@ As you can see, an array in which a non-primitive data type is mutable. Non-prim
 ```js
 let nums = [1, 2, 3]
 let numbers = [1, 2, 3]
+
 console.log(nums == numbers)  // false
 
 let userOne = {
@@ -108,11 +113,13 @@ name:'Asabeneh',
 role:'teaching',
 country:'Finland'
 }
+
 let userTwo = {
 name:'Asabeneh',
 role:'teaching',
 country:'Finland'
 }
+
 console.log(userOne == userTwo)
 ```
 
@@ -122,6 +129,7 @@ Non-primitive values are referred to as reference types because they are being c
 ```js
 let nums = [1, 2, 3]
 let numbers = nums
+
 console.log(nums == numbers)  // true
 
 let userOne = {
@@ -129,7 +137,9 @@ name:'Asabeneh',
 role:'teaching',
 country:'Finland'
 }
+
 let userTwo = userOne
+
 console.log(userOne == userTwo)  // true
 ```
 
@@ -151,6 +161,7 @@ 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)
 ```
 
@@ -177,7 +188,8 @@ 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
+
+// Let us  create random number between 0 to 10
 const num = Math.floor(Math.random () * 11) // creates random number between 0 and 10
 console.log(num)
 
@@ -278,7 +290,9 @@ let language = 'JavaScript'
 let job = 'teacher'
 let age = 250
 let fullName = firstName + space + lastName
+
 let personInfoOne = fullName + '. I am ' + age + '. I live in ' + country; // ES5
+
 console.log(personInfoOne)
 ```
 
@@ -339,10 +353,10 @@ To create a template string, we use two backticks. We can inject data as express
 **Example: 1**
 
 ```js
-console.log(`The sum of 2 and 3 is 5`)
+console.log(`The sum of 2 and 3 is 5`)              // statically writing the data
 let a = 2
 let b = 3
-console.log(`The sum of ${a} and ${b} is ${a + b}`)
+console.log(`The sum of ${a} and ${b} is ${a + b}`) // injecting the data dynamically
 ```
 
 **Example:2**

03_Day/03_booleans_operators_date.md

@@ -1,7 +1,6 @@
 ## Table of Contents
 
 [<< Day 2](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/02_Day/02_day_data_types.md) | [Day 4 >>](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/04_Day/04_day_conditionals.md)
---
 
 ![Thirty Days Of JavaScript](./day_1_3.png)
 
@@ -52,10 +51,10 @@ A boolean data type represents one of the two values:_true_ or _false_. Boolean
 **Example: Boolean Values**
 
 ```js
-let isLightOn = true;
-let isRaining = false;
-let isHungry = false;
-let isMarried = true;
+let isLightOn = true
+let isRaining = false
+let isHungry = false
+let isMarried = true
 let truValue = 4 > 3 // true
 let falseValue = 3 < 4 // false
 ```
@@ -85,15 +84,15 @@ It is good to remember those truthy values and falsy values. In later section, w
 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 will be undefined.
 
 ```js
-let firstName;
-console.log(firstName); //not defined, because it is not assigned to a value yet
+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
+let empty = null
+console.log(empty) // -> null , means no value
 ```
 
 ## Operators
@@ -117,36 +116,38 @@ Arithmetic operators are mathematical operators.
 
 - Addition(+): a + b
 - Subtraction(-): a - b
-- Multiplication(*): 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 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
 
-let PI = 3.14;
-let radius = 100; // length in meter
+console.log(sum, diff, mult, div, remainder, powerOf) // 7,1,12,1.33,1, 64
+
+let PI = 3.14
+let radius = 100          // length in meter
 
-const gravity = 9.81; // in m/s2
-let mass = 72; // in Kilogram
-const boilingPoint = 100; // temperature in oC, boiling point of water
-const bodyTemp = 37; // body temperature in oC
+const gravity = 9.81      // in m/s2
+let mass = 72             // in Kilogram
+const boilingPoint = 100  // temperature in oC, boiling point of water
+const bodyTemp = 37       // body temperature in oC
 
 //Let us calculate area of a circle
-const areaOfCircle = PI * radius * radius;
-console.log(areaOfCircle); // -> 314 m
+const areaOfCircle = PI * radius * radius
+console.log(areaOfCircle)  //  314 m
+
 // Let us calculate weight of an object
-const weight = mass * gravity;
-console.log(weight); // -> 706.32 N(Newton)
+const weight = mass * gravity
+console.log(weight)        // 706.32 N(Newton)
 
 //Concatenating string with numbers using string interpolation
 /*
@@ -156,7 +157,7 @@ console.log(weight); // -> 706.32 N(Newton)
  */
 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
@@ -193,7 +194,6 @@ 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
@@ -215,7 +215,6 @@ The following symbols are the common logical operators:
 ! negates true to false, false to true.
 
 ```js
-
 //&& ampersand operator example
 
 const check = 4 > 3 && 10 > 5 // true and true -> true
@@ -450,14 +449,14 @@ console.log(now.getSeconds()) // 41, because the time is 00:56:41
 
 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()*
+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()*
+1. Using _Date.now()_
 
 ```js
 const allSeconds = Date.now() //
@@ -470,12 +469,12 @@ 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)
+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
 ```
 
@@ -509,13 +508,13 @@ console.log(`${date}/${month}/${year} ${hours}:${minutes}`) // 4/1/2020 0:56
    The perimeter of the triangle is 12
    ```
 
-2. 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))
-3. 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.
-4. Calculate the slope, x-intercept and y-intercept of y = 2x -2
-5. Slope is (m = y2-y1/x2-x1). Find the slope between point (2, 2) and point(6,10)
-6. Compare the slope of above two questions.
-7. Calculate the value of y (y = x^2 + 6x + 9). Try to use different x values and figure out at what x value y is 0.
-8. Writ a script that prompt a user to enters hours and rate per hour. Calculate pay of the person?
+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 = y2-y1/x2-x1). 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^2 + 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 enters hours and rate per hour. Calculate pay of the person?
 
    ```sh
    Enter hours: 40
@@ -523,7 +522,7 @@ console.log(`${date}/${month}/${year} ${hours}:${minutes}`) // 4/1/2020 0:56
    Your weekly earning is 1120
    ```
 
-9. 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
+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 yours you live: 100