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

function nameOfFunction() { // function body }

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

This will print the value of a in JavaScript console

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

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 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 }

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

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

Iterative statement facilitates programmer to execute any block of code lines repeatedly and can be controlled as per conditions added by the programmer.

for (initialization; condition; incrementation;) { // code block to be executed }

for (let i = 0; i < 5; i++) { text += "Iteration number: " + i + "<br>"; }

Runs the code till the specified condition is true

while (condition) { // code block to be executed }

A do while loop is executed at least once despite the condition being true or false

do { // run this code in block i++; } while (condition);

The string is a sequence of characters that is used for storing and managing text data.

Returns the character from the specified index.

Returns the index of the first occurrence of the specified character from the string else -1 if not found.

Searches a string for a match against a regular expression.

Searches a string for a match against a specified string or char and returns a new string by replacing the specified values.

Searches a string against a specified value.

Splits a string into an array consisting of substrings.

Returns a substring of a string containing characters from the specified indices.

The array is a collection of data items of the same type. In simple terms, it is a variable that contains multiple values.

var fruit = ["element1", "element2", "element3"];

Returns the index of the specified item from the array.

This method reverses the order of the array elements.

Sorts the array elements in a specified manner.

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JavaScript Cheatsheet