Array Data Structure

Last updated on 23 Mar, 2022

An array is a collection of similar items stored in contigous memory locations. We discuss here about arrays in the context of JavaScript language.

Create an Array

In JavaScript, an array of 10 elements can be created using:

const arr = new Array(10);

Read Array Element

Each element in an array has an index starting from 0. An array element can be obtained using its index. Therefore, 5th element of the array can be accessed using:

console.log(arr[4]); // 5th element is in 4th index

Read All Elements

We can use a for loop to iterate through an array.

const arr = ["Apple", "Orange", "Banana"];

for (let i = 0; i < arr.length; i++) {
  console.log(arr[i]);
}

We can also use array forEach() method to iterate through an array.

const arr = ["Apple", "Orange", "Banana"];

arr.forEach(function (item) {
  console.log(item);
});