Arrays

Syntax

• array = [value, value, …]
• array = new Array(value, value, …)
• array = Array.of(value, value, …)
• array = Array.from(arrayLike)

Remarks

Summary: Arrays in JavaScript are, quite simply, modified Object instances with an advanced prototype, capable of performing a variety of list-related tasks. They were added in ECMAScript 1st Edition, and other prototype methods arrived in ECMAScript 5.1 Edition.

Warning: If a numeric parameter called n is specified in the new Array() constructor, then it will declare an array with n amount of elements, not declare an array with 1 element with the value of n!

console.log(new Array(53)); // This array has 53 'undefined' elements!

That being said, you should always use [] when declaring an array:

console.log([53]); // Much better!

Converting Array-like Objects to Arrays

Reducing values

Mapping values

Filtering Object Arrays

Sorting Arrays

Iteration

Removing duplicate elements

Destructuring an array

Array comparison

Reversing arrays

Concatenating Arrays

Shallow cloning an array

Merge two array as key value pair

Array spread rest

Finding the minimum or maximum element

Removing items from an array

Filtering values

Standard array initialization

Removing all elements

Searching an Array

Convert a String to an Array

Joining array elements in a string

Removing / adding elements using splice

The entries() method

Remove value from array

Logical connective of values

Flattening Arrays

Object keys and values to array

Append / prepend items to array

Checking if an object is an array

Sorting multidimensional array

Insert an item into an array at a specific index

Test all array items for equality

Copy part of an array with slice()

Using map to reformat objects in an array