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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Basic JavaScript Tutorial</title>
<!-- stylesheet -->
<link rel="stylesheet" href="style.css">
<link rel="stylesheet" href="responsive.css">
</head>
<body>
<section class="header">
<div class="container">
<div class="row">
<div class="title">
<h1><span class="color-first">Basic</span><span class="color-second">JavaScript Tutorial</span></h1>
</div>
<div class="table">
<h2 class="content-head">Content</h2>
<ul>
<li>Variable</li>
<li>Variable Types</li>
<li>If-Else Statement</li>
<li>For Loop</li>
<li>Array</li>
<li>While Loop</li>
<li>Function</li>
<li>Recursive Function</li>
<li>Objects</li>
<li>Dictionary</li>
<li><a href="https://github.com/mohit838/JavaScript-Tutorial/blob/main/fulltutorial.js" target="_blank">Source Code</a></li>
</ul>
</div>
<div class="code">
<h2 class="table">Main Code</h2>
<pre class="js-code">
<b>//Hello in Js</b>
console.log(25);
console.log("Hello World!");
console.log('Second Hello World!');
<b>//Variable
//**Note 1: Variable must be "camelCase".
//**Note 2: "Semicolon" after every line.
//**Note 3: "caseSensitive".
</b>
<b>//Number</b>
var priceOfPen = 55;
console.log(priceOfPen); <b>//Output: 55</b>
console.log(typeof priceOfPen); <b>//Output: Number</b>
<b>//String</b>
var yourName = 'XyZ';
console.log(yourName); <b>//Output: XyZ</b>
console.log(typeof yourName); <b>//Output: String</b>
<b>//Boolean</b>
var isHot = true;
console.log(isHot); <b>//Output: String</b>
console.log(typeof isHot); <b>//Output: Boolean</b>
<b>//All LowerCase, UpperCase, IndexOf, Split</b>
var yourSelf = "I'm a student.";
console.log(yourSelf.toLowerCase()); <b>//Output: i'm a student.</b>
console.log(yourSelf.toUpperCase()); <b>//Output: I'M A STUDENT.</b>
console.log(yourSelf.indexOf('a')); <b>//Output: 4 [i=0, '=1, m=2, ' '=3, a=4]</b>
<b>//***Special Note: if indexOf('value') "Output: -1" means Result is "NotFound".</b>
console.log(yourSelf.split(' '));
<b>//Output: ['I'm', 'a', 'student.']</b>
console.log(yourSelf.split('a'));
<b>//Output: ['I'm ', ' student.']
//**Note: It can split sentence in to words where space(" ") or any character or string.
</b>
<b>//Add, Sub, Mul, Div, Modulo All are the same operation (+, -, *, /, %)
</b>
var numberOne = 10;
var numberTwo = 20;
var result = numberOne + numberTwo;
console.log(result); <b>//Output: 30</b>
<b>//**Special Case</b>
var numOne = 'abc';
var numTwo = 20;
var result = numOne + numTwo;
console.log(result); <b>//Output: abc20</b>
var numOne = 'abc';
var numTwo = 'xyz';
var result = numOne + numTwo;
console.log(result); <b>//Output: abcxyz</b>
var numOne = 'abc';
var numTwo = 'xyz';
console.log(numOne+" "+numTwo); <b>//Output: abc xyz</b>
<b>//String to number conversion [It's maybe Float or Int]</b>
var numOne = 10;
var numTwo = '20.5';
numTwo = parseFloat(numTwo);
numThree = parseInt(numTwo);
var result = numOne + numTwo;
var result2 = numOne + numThree;
console.log(result); <b>//Output: 30.5</b>
console.log(result2); <b>//Output: 30</b>
<b>//Increment Number</b>
var numOne = 10;
var numTwo = 20.5;
var numThree = 21.5;
var numFour = 22.5
var numFive = 23.5;
var result1 = numTwo + 1; <b>//Increment First</b>
var result2 = ++numThree; <b>//Increment First</b>
var result3 = numFour++; <b>//Using in For/While Loop; Increment Later</b>
<b>//Look Carefully</b>
numFive++;
console.log(result1); <b>//Output: 21.5</b>
console.log(result2); <b>//Output: 22.5</b>
console.log(result3); <b>//Output: 22.5</b>
console.log(numFive); <b>//Output: 24.5</b>
<b>//**Special Case</b>
var numOne = 10;
var result1 = '' + numOne; <b>//Empty string</b>
var result2 = ' ' + numOne; <b>//Space here</b>
console.log(result1); <b>//Output: 10</b>
console.log(result2); <b>//Output: 10</b>
<b>//Look Carefully For Upper Code</b>
console.log(typeof result1); <b>//Output: string</b>
console.log(typeof result2); <b>//Output: string</b>
<b>//Floating Addition</b>
var numOne = 10.02;
var numTwo = 15.20;
var result = numOne + numTwo;
console.log(result); <b>//Output: 25.22</b>
<b>//**Special Case for Floating</b>
var numOne = 0.1;
var numTwo = 0.2;
console.log(numOne + numTwo); <b>//Output: 0.30000000000000004</b>
var numOne = 0.1;
var numTwo = 0.2;
var sum = numOne + numTwo;
sum = sum.toFixed(2);
console.log(sum); <b>//Output: 0.30</b>
<b>//Absolute Number</b>
var numOne = -10;
var absoluteNum = Math.abs(numOne);
console.log(absoluteNum); <b>//Output 10</b>
<b>//Round and Ceiling any fraction</b>
var numOne = -10.20;
var absoluteNum = Math.abs(numOne);
var roundNum = Math.round(absoluteNum);
var ceilingNum = Math.ceil(absoluteNum);
console.log(absoluteNum); <b>//Output: 10.2</b>
console.log(roundNum); <b>//Output: 10</b>
console.log(ceilingNum); <b>//Output: 11</b>
<b>//Random Number Generator</b>
var number = Math.random() * 100;
var result = Math.round(number); <b>//Or you can use Math.Ceil()</b>
console.log(result); <b>//Output: Any Number between 0 to 100</b>
<b>//Simple If-else Statement</b>
var num = 10;
if(num > 5){
console.log("Number is Greater than 5."); <b>//Output: Number is Greater than 5.</b>
}
else{
console.log("Number is not greater than 5.");
}
<b>//Another example</b>
var num2 = 2;
if(num2 > 5){
console.log("Number is Greater than 5.");
}
else{
console.log("Number is not greater than 5."); <b>//Output: Number is not greater than 5.</b>
}
<b>//**Special Note
//Note1: Condition may [ <, >, ==, != {not equal}, ===, || {or}, && {and} ]</b>
<b>//Another Example</b>
var job = true; <b>//It may false</b>
var salary = 30000;
if (job == true && salary > 20000){ <b>//It may && {and}, || {or}</b>
console.log("Make a Tour Plan.");
}
else {
console.log("Not sure for tour plan.");
}
<b>**What will be the output?? Think!!!</b>
<b>//Another Example</b>
var job = true; <b>//It may false</b>
var salary = 30000;
if (job == true && salary > 30000){ <b>//It may && {and}, || {or}</b>
console.log("Make a Tour Plan.");
}
else if(job == true && salary <= 30000){
console.log("Don't think about Buying a house.")
}
else {
console.log("Not sure for tour plan.");
}
<b>//Output: Don't think about Buying a house.
//**Note:
//Condition are both must be true for '&&'
//Condition are one must be true for '||'
</b>
<b>//Date in Js</b>
var date = new Date('2021-05-05');
console.log(date); <b>//Output: Wed May 05 2021 06:00:00 GMT+0600 (East Kazakhstan Time)</b>
<b>//**Without Parameter</b>
var date = new Date();
console.log(date); <b>//Output: Sun Nov 07 2021 12:30:06 GMT+0600 (East Kazakhstan Time)</b>
<b>//Array in Js</b>
var array = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
var sliceArray = array.slice(0,5);
var sliceArray2 = array.slice(2,8);
console.log(sliceArray); <b>//Output: ['a', 'b', 'c', 'd', 'e']</b>
console.log(sliceArray2); <b>//Output: ['c', 'd', 'e', 'f', 'g', 'h']</b>
console.log(array.length); <b>//output: 10</b>
console.log(array[5]); <b>//Output: f</b>
array['f'] = 'z';
console.log(array); <b>//Output: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', f: 'z']</b>
array[5] = 'z'; <b>//Using IndexNumber</b>
console.log(array); <b>//Output: ['a', 'b', 'c', 'd', 'e', 'z', 'g', 'h', 'i', 'j', f: 'z']</b>
var postion = array.indexOf('e');
console.log(postion); <b>//Output: 4</b>
<b>//**If outputIs: -1 then there is no matching elements</b>
<b>//New Element Add in Array</b>
var array = [1, 2, 3, 4, 5, 6, 7, 8, 9];
array.push(10);
console.log(array); <b>//Output: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]</b>
array.pop(); <b>//By Default Last Element Will be deleted</b>
console.log(array); <b>//Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]</b>
array.unshift(10); <b>//Add Element From Beginning</b>
console.log(array); <b>//Output: [10, 1, 2, 3, 4, 5, 6, 7, 8, 9]</b>
array.shift(); <b>//Remove Element From Beginning</b>
console.log(array); <b>//Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]</b>
<b>//Simple While Loop</b>
var num = 0;
while (num < 5) {
console.log(num); <b>//Output: 0 1 2 3 4</b>
num++;
}
<b>//Simple For Loop</b>
var num = 5;
for (var i = 0; i < num; i++) {
console.log(i); <B>//Output: 1 2 3 4</B>
}
<b>//Simple For Loop In Array</b>
var array = [1, 2, 3, 4, 5, 6, 7, 8, 9];
for (var i = 0; i < array.length; i++) {
console.log(array[i]); <b>//Output: 1 2 3 4 5 6 7 8 9</b>
}
<b>//**Note:
//console.log(array[i]); array[i]= value
//console.log(i); i = IndexOfArrayValue</b>
<b>//Switch Case in Js</b>
var num = 1;
switch (num){
case 1:
console.log(num);
break;
default:
console.log("Error Entry!!!");
break;
}
<b>//Function in Js</b>
function addNum(a, b){
var a; var b;
var result = a + b;
return result;
}
var total = addNum(5, 10);
console.log(total); <b>//Output: 15</b>
<b>//**Look Carefully</b>
function addNum(a, b){
var result = a + b;
return result;
}
var total1 = addNum(15, 10);
var total2 = addNum(50, 100);
console.log(total1); <b>//Output: 25</b>
console.log(total2); <b>//Output: 150</b>
<b>//Another Method of Showing Result</b>
console.log(total1, total2); <b>//Output: 25 150</b>
<b>//**Objects in Js */</b>
var student = {
Name: 'Jack',
Id: 1,
Ph: 123
};
console.log(student);
console.log(student.Name); <b>//Output: Jack</b>
console.log(student['Name']); <b>//Output: Jack</b>
var stuName = 'Name';
console.log(student[stuName]); <b>//Output: Jack</b>
<b>//Update Objects</b>
student.Id = 2;
console.log(student.Id); <b>//Output: 2</b>
console.log(student); <b>//Output: {Name: 'Jack', Id: 2, Ph: 123}</b>
<b>//Add Property or Update Property</b>
student.Address = 'NY';
console.log(student.Address); <b>//Output: NY</b>
console.log(student); <b>//Output: Name: 'Jack', Id: 2, Ph: 123, Address: 'NY'}</b>
<b>//Const and Let Example (ES6 version in Js)</b>
const num = 10; <b>//Never change the value.</b>
let number = 20; <b>//You can change later.</b>
<b>//Factorial Using Funcions</b>
function factorial(num){
if(num == 0){
return 1;
}
return num * factorial(num - 1);
}
console.log(factorial(3)); <b>//Output: 6</b>
<b>//Fibonacci Series Using Funcions</b>
function fibonacci(num){
if(num == 0){
return 0;
}
else if(num == 1){
return 1;
}
else{
return fibonacci(num - 1) + fibonacci(num - 2);
}
}
for(var i = 0; i < 6; i++) {
console.log(fibonacci(i)); <b>//Output: 0 1 1 2 3 5</b>
}
<b>//Check Prime Number</b>
var number = 19;
var prime;
for (var i = 2; i < number; i++) {
prime = (number % i);
if (prime == 0) {
console.log("Not a Prime.");
}
else{
console.log("Prime number.");
}
}
<b>//Another Example of Check Prime Number</b>
var number = 9;
var prime;
number = Math.sqrt(number) <b>//Finding the Square Root</b>
for (var i = 2; i < number; i++) {
prime = (number % i);
if (prime == 0) {
console.log("Not a Prime.");
}
else{
console.log("Prime number.");
}
}
<b>//** Special Note:
//== in JavaScript is used for comparing two variables, but it ignores the datatype of variable.
//=== is used for comparing two variables, but this operator also checks datatype and compares two values.
</b>
<b>//Swaping Values using Temp </b>
var a = 1;
var b = 2;
var temp;
console.log("Before Swap Values A: " + a + " Values B: " + b); <b>//Output: Before Swap Values: 1 Values: 2</b>
temp = a;
a = b;
b = temp;
console.log("After Swap Values A: " + a + " Values B: " + b); <b>//Output: After Swap Values: 2 Values: 1</b>
<b>//Swaping Values Without Temp</b>
var x = 10;
var y = 20;
x = x + y;
y = x - y;
x = x - y;
console.log("After Swap Values X: " + x + " Values Y: " + y) <b>//Output: After Swap Values: 20 Values: 10</b>
<b>//Another Way of Swaping with array</b>
var x = 55;
var y = 50;
[x, y] = [y, x];
console.log("After Swaping Values X: " + x + " Values Y: " + y); <b>//Output: After Swaping Values X: 50 Values Y: 55</b>
<b>//Max Finding Using Method</b>
var a = 1000;
var b = 5000;
var c = 10000;
var result = Math.max(a, b, c);
console.log(result); <b>//Output: 10000</b>
<b>//Array Sum Calculation</b>
var array = [1, 2, 3, 4, 5, 6, 7, 8, 9];
function sumOfArray(array) {
var total = 0;
for (var i = 0; i < array.length; i++) {
var total = total + array[i];
}
return total;
}
console.log("Array Sum Calculation: " + (sumOfArray(array))); <b>//Output: Array Sum Calculation: 45</b>
<b>//** This may use in Shooping Cart Calculation */></b>
<b>//Remove Duplicate Element From Array</b>
var array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 3, 5, 6];
var unique = [];
for (var i = 0; i < array.length; i++) {
var element = array[i];
var indexOf = unique.indexOf(element);
if(indexOf == -1) {
unique.push(element);
}
}
console.log(unique); <b>//Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]</b>
<b>//Count White Spaces</b>
var text = 'I am a JavaScript';
var count = 0;
for (var i = 0; i <text.length; i++) {
var char = text[i];
if (char == ' ' && text[i-1] == ' ') {
count++;
}
}
console.log(count); <b>//Output: 3</b>
<b>//Reverse String</b>
function reverseString(str) {
var reverse = "";
for (var i = 0; i < str.length; i++){
var char = str[i];
reverse = char + reverse;
}
return reverse;
}
console.log(reverseString("I am Js"));
<b>//Pallindrome Number or String</b>
function reverseString(str) {
var reverse = "";
for (var i = 0; i < str.length; i++){
var char = str[i];
reverse = char + reverse;
}
return reverse;
}
var str ='DaD';
var str2 ='Dude';
if(str == reverseString(str)){
console.log("This is Pallindrome"); <b>//Output: This is Pallindrome </b>
}
else{
console.log("This is not a Pallindrome");
}
if(str2 == reverseString(str2)){
console.log("This is Pallindrome");
}
else{
console.log("This is not a Pallindrome"); <b>//Output: This is Not a Pallindrome </b>
}
<b>//DOM: Document Object Modeling
/**
*Document.getElementById()
*Document.getElementByClass()
*Document.getElementByTagName()
*Document.querySelector()
*Document.querySelectorAll()
*Using With HTML
*/</b>
</pre>
</div>
</div>
</div>
</section>
</body>
</html>