Arrays Defintion

Arrays are list-like objects whose prototype has methods to perform traversal and mutation (the action or process of changing) operations. The length of a JavaScript array nor the types of its elements are fixed.

An array is a special type of variable, which can store multiple values. Each value is associated with numeric index starting with 0.

Create an array

// these are the two ways to create an empty array
let emotions = new Array();
let emotions = [];

// we add items to the array
let emotions = ['😀', '😂']

console.log(emotions.length)
//2

Access an Array item by using its index position

let first = emotions[0]
// '😀'

let last = emotions[emotions.length - 1]
// '😂'

Loop over the array

emotions.forEach(function(item, index, array) {
  console.log(item, index)
})
// '😀' 0
// '😂' 1

Add an item to the end of an Array

let newLength = emotions.push('🥰')
// ['😀', '😂', '🥰']

Remove an item from the end of an Array

let last = emotions.pop() // remove 🥰 (from the end)
// ['😀', '😂']

Remove an item from the beginning of an Array

let first = emotions.shift() // remove 😀 from the front
// ['😂']

Find the index of an item in the Array

emotions.push('🥳')
// ['😀', '😂', '🥳']

let pos = emotions.indexOf('😂')
// 1

Learn more about Arrays here 👇🏾

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