01 Day activities

01_Day_JavaScript_Refresher/countries.js

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+const countries = [
+    'Albania',
+    'Bolivia',
+    'Canada',
+    'Denmark',
+    'Ethiopia',
+    'Finland',
+    'Germany',
+    'Hungary',
+    'Ireland',
+    'Japan',
+    'Kenya',
+  ]
+  

01_Day_JavaScript_Refresher/ex1.js

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+
+
+//Declare an empty array;
+const emptyArray = Array()
+console.log('Declare an empty array;: Empty array '+emptyArray)
+
+//Declare an array with more than 5 number of elements
+const arrayOfSixElements = [1, 2, 3, 4, 5, 6, 7, 8, 9]
+console.log('Declare an array with more than 5 number of elements: '+arrayOfSixElements)
+
+//Find the length of your array
+const arrayLength = arrayOfSixElements.length
+console.log('Find the length of your array: '+arrayLength)
+
+//Get the first item, the middle item and the last item of the array
+console.log('First item '+arrayOfSixElements[0])
+let middleIndex=Math.round(arrayLength/2)
+console.log('Middle item '+arrayOfSixElements[middleIndex])
+console.log('Last item '+arrayOfSixElements[arrayLength-1])
+
+//Declare an array called mixedDataTypes, put different data types in the array and find the length of the array. The array size should be greater than 5
+const mixedDataTypes=['apple', 3, true, 3.14, 9.8, 'speed']
+console.log(mixedDataTypes)
+
+/*
+Declare an array variable name itCompanies and assign initial values Facebook, Google, Microsoft, Apple, IBM, Oracle and Amazon
+Print the array using console.log()
+Print the number of companies in the array
+Print the first company, middle and last company
+Print out each company
+*/
+const itCompanies=['Facebook', 'Google', 'Microsoft', 'Apple', 'IBM', 'Oracle', 'Amazon']
+console.log(itCompanies)
+console.log(itCompanies.length)
+console.log(itCompanies[0])
+console.log(itCompanies[Math.round(itCompanies.length/2)])
+console.log(itCompanies[itCompanies.length-1])
+console.log(itCompanies.join(', '))
+
+//Change each company name to uppercase one by one and print them out
+
+//Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
+
+
+/*
+Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
+Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found
+Filter out companies which have more than one 'o' without the filter method
+Sort the array using sort() method
+Reverse the array using reverse() method
+Slice out the first 3 companies from the array
+Slice out the last 3 companies from the array
+Slice out the middle IT company or companies from the array
+Remove the first IT company from the array
+Remove the middle IT company or companies from the array
+Remove the last IT company from the array
+Remove all IT companies
+
+*/
+

01_Day_JavaScript_Refresher/ex1_cond.js

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+console.log('Conditions. Ex Level 1.')
+
+let age=prompt('Enter your age:', 0)
+console.log('Enter your age: '+age)
+if (age>=18) {
+    console.log('You are old enough to drive.')
+} else {
+    console.log('You are left with 3 years to drive.')
+}
+
+
+let score=prompt('Enter your scores:', 0)
+console.log('Enter your scores: '+score)
+if (score >= 0 && score <= 49) {
+    console.log('You score is F.')
+} else if (score >= 50 && score <= 59) {
+    console.log('You score is D.')
+} else if (score >= 60 && score <= 69) {
+    console.log('You score is C.')
+} else if (score >= 70 && score <= 89) {
+    console.log('You score is B.')
+} else if (score >= 90 && score <= 100) {
+    console.log('You score is A.')
+}    
+
+let month=prompt('Enter a month:', 0)
+console.log('Enter a month (English full name): '+month)
+switch (month.toUpperCase()) {
+    //January has 31 days.
+    case 'JANUARY'||'MARCH'||'MAY'||'JULY'||'AUGUST'||'OCTOBER'||'DECEMBER': 
+        console.log(month[0].toUpperCase()+month.slice(1)+' has 31 days')
+        break
+    case 'FEBRUARY': 
+        console.log(month[0].toUpperCase()+month.slice(1)+' has 28/29 days')
+        break
+    case 'APRIL'||'JUNE'||'SEPTEMBER'||'NOVEMBER': 
+        console.log(month[0].toUpperCase()+month.slice(1)+' has 30 days')
+        break
+}
+

01_Day_JavaScript_Refresher/ex2.js

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+let text =
+  'I love teaching and empowering people. I teach HTML, CSS, JS, React, Python.'
+text=text.replace(',', '')
+text=text.replace('.', '')  
+let words=text.split(' ')
+
+console.log(words)
+console.log(words.length)
+
+
+//
+const shoppingCart = ['Milk', 'Coffee', 'Tea', 'Honey']
+console.log(shoppingCart)
+//add 'Meat' in the beginning of your shopping cart if it has not been already added
+if (!shoppingCart.includes('Meat')) {
+    shoppingCart.unshift('Meat')
+}
+console.log(shoppingCart)
+
+//add Sugar at the end of you shopping cart if it has not been already added
+if (!shoppingCart.includes('Sugar')) {
+    shoppingCart.push('Sugar')
+}
+console.log(shoppingCart)
+
+//remove 'Honey' if you are allergic to honey
+let isHoneyAllergic=true
+if (isHoneyAllergic) {
+    if (shoppingCart.indexOf('Honey')>-1) {
+        shoppingCart.splice(shoppingCart.indexOf('Honey'), 1)
+    }
+}
+console.log(shoppingCart)
+
+//modify Tea to 'Green Tea'
+let index=shoppingCart.indexOf('Tea')
+if (index>-1) {
+    shoppingCart[index]='Green Tea'
+}
+console.log(shoppingCart)

01_Day_JavaScript_Refresher/ex_func.js

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+console.log('Function Exercises')
+
+function solveQuadratic (a=0, b=0, c=0) {
+    console.log('a='+a+', b='+b+', c='+c)
+    let x1
+    let x2
+    let D = b*b - 4*a*c
+    if (D<0) {
+        return null
+    } else if (D==0) {
+        x1=-1*b / 2*a
+        return x1
+    } else if (D>0) {
+        x1=(-1*b + Math.sqrt(D)) / 2*a 
+        x2=(-1*b - Math.sqrt(D)) / 2*a 
+        return {x1, x2}
+    }
+    console.log('-----------------')
+}
+
+console.log(solveQuadratic()) // {0}
+console.log(solveQuadratic(1, 4, 4)) // {-2}
+console.log(solveQuadratic(1, -1, -2)) // {2, -1}
+console.log(solveQuadratic(1, 7, 12)) // {-3, -4}
+console.log(solveQuadratic(1, 0, -4)) //{2, -2}
+console.log(solveQuadratic(1, -1, 0)) //{1, 0}

01_Day_JavaScript_Refresher/ex_obj.js

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+console.log('Objects Exercises')
+
+/*
+Create an empty object called dog
+Print the the dog object on the console
+Add name, legs, color, age and bark properties for the dog object. The bark property is a method which return woof woof
+Get name, legs, color, age and bark value from the dog object
+Set new properties the dog object: breed, getDogInfo
+*/
+
+const dog = {}
+console.log(dog)
+
+dog.name='Dog'
+dog.color='Brown'
+dog.legs=4
+dog.age=5
+dog.bark=function () {
+    console.log('woof woof!')
+}
+dog.breed='French'
+dog.getDogInfo = function () {
+    console.log('Name: '+dog.name)
+    console.log('Breed: '+dog.breed)
+    console.log('Age: '+dog.age)
+    console.log('Color: '+dog.color)
+    console.log('Legs: '+dog.legs)    
+}
+dog.getDogInfo()
+console.log('Voice!')
+dog.bark()
+
+
+

01_Day_JavaScript_Refresher/hello.js

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+console.log('Hello, World!')

01_Day_JavaScript_Refresher/index.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>30DaysOfScript:Inline Script</title>
+  </head>
+  <body>
+    <button onclick="alert('Welcome to 30DaysOfJavaScript!')">Click Me</button>
+  </body>
+</html>

01_Day_JavaScript_Refresher/index2.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>30DaysOfScript:Internal Script</title>
+    <button onclick="alert('Welcome to 30DaysOfJavaScript!');">Click Me</button>
+    <script>
+      console.log('Welcome to 30DaysOfJavaScript')
+    </script>
+  </head>
+  <body></body>
+</html>

01_Day_JavaScript_Refresher/index3.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>30DaysOfJavaScript:External script</title>
+    <script src="introduction.js"></script>
+  </head>
+  <body>
+    <script src="introduction.js"></script>
+  </body>
+</html>

01_Day_JavaScript_Refresher/index4.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Multiple External Scripts</title>
+  </head>
+  <body>
+    <script src="./hello.js"></script>
+    <script src="./introduction.js"></script>
+  </body>
+</html>

01_Day_JavaScript_Refresher/indexCond.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>01-Day. Execise level 1</title>
+  </head>
+  <body>
+    <script src="ex1_cond.js"></script>
+  </body>
+</html>

01_Day_JavaScript_Refresher/indexEx1.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>01-Day. Execise level 1</title>
+  </head>
+  <body>
+    <script src="ex1.js"></script>
+    <script src="countries.js"></script>
+    <script src="webTechs.js"></script>
+    <script src="main.js"></script>
+    <script src="ex2.js"></script>
+    <script src="ex1_cond.js"></script>
+  </body>
+</html>

01_Day_JavaScript_Refresher/indexFunc.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>01-Day. Execise level 1</title>
+  </head>
+  <body>
+    <script src="ex_func.js"></script>
+  </body>
+</html>

01_Day_JavaScript_Refresher/indexObj.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>01-Day. Execise level 1</title>
+  </head>
+  <body>
+    <script src="ex_obj.js"></script>
+  </body>
+</html>

01_Day_JavaScript_Refresher/introduction.js

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+console.log('Welcome to 30DaysOfJavaScript')

01_Day_JavaScript_Refresher/main.js

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+console.log(countries)
+console.log(webTechs)

01_Day_JavaScript_Refresher/webTechs.js

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+const webTechs = [
+    'HTML',
+    'CSS',
+    'JavaScript',
+    'React',
+    'Redux',
+    'Node',
+    'MongoDB',
+  ]