add items to an array in javascript code example

Example 1: javascript insert item into array

var colors=["red","blue"];
var index=1;

//insert "white" at index 1
colors.splice(index, 0, "white");   //colors =  ["red", "white", "blue"]

Example 2: how to append an element to an array in javascript

//Use push() method
//Syntax: 
array_name.push(element);
//Example: 
let fruits = ["Mango", "Apple"];
//We want to append "Orange" to the array so we will use push() method
fruits.push("Orange"); 
//There we go, we have successfully appended "Orange" to fruits array!