JavaScript cheat sheet

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JavaScript Basics
Set of JavaScript basic syntax to add, execute and write basic programming paradigms in
Javascript

On Page Script

Adding internal JavaScript to HTML


<script type="text/javascript"> //JS code goes here </script>


External JS File

Adding external JavaScript to HTML


<script src="filename.js"></script>


Functions

JavaScript Function syntax


function nameOfFunction () {
// function body
}


DOM Element

Changing content of a DOM Element


document.getElementById("elementID").innerHTML = "Hello World!";


Output

This will print the value of a in JavaScript console


console.log(a);



Conditional Statements

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Conditional statements are used to perform operations based on some conditions.

If Statement

The block of code to be executed, when the condition specified is true.


if (condition) {
// block of code to be executed if the condition is true
}


If-else Statement

If the condition for the if block is false, then the else block will be executed.


if (condition) {
// block of code to be executed if the condition is true
} else {
// block of code to be executed if the condition is false
}


Else-if Statement

A basic if-else ladder


if (condition1) {
// block of code to be executed if condition1 is true
} else if (condition2) {
// block of code to be executed if the condition1 is false and condition2 is
} else {
// block of code to be executed if the condition1 is false and condition2 is
}



Switch Statement

Switch case statement in JavaScript


switch(expression) {
case x:
// code block
break;
case y:
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