JavaScript array is used to store multiple elements in a single variable.

let a = ["HTML", "CSS", "JS"]
console.log(a)

[ 'HTML', 'CSS', 'JS' ]

Using New Keyword

// Declaring an array using Array Constructor
let a = new Array(3)
a[0] = "HTML"
a[1] = "CSS"
a[2] = "JS"
console.log(a)

[ 'HTML', 'CSS', 'JS' ]

All the JavaScript array-related articles into three sections based on their difficulty levels: Easy, Medium, and Hard. This organization aims to help learners gradually progress from basic to more complex concepts.

Easy:

The Easy level includes articles that cover fundamental operations and straightforward tasks with JavaScript arrays.

• Insert an Element
• Remove Element
• Remove Duplicates
• Get a Value from a JSON Array
• Replace an Item
• Find Duplicates
• Select a Random Element
• Insert at Specific Index
• Get Array Length
• An Array of Given Size
• Append in an Array
• First and Last in an Array
• Reverse an Array
• Empty an Array in JavaScript
• Convert an Array into a String
• Search an Element
• Largest in an Array
• First N from an Array

Medium:

The Medium level includes articles that delve deeper into working with JavaScript arrays, exploring more advanced operations and methods:

• Modify an Object's Property in Array Objects
• Sort Object Array by Date
• Copy Items into Another Array
• Count Occurrences of All Items
• Convert Array to Object
• Compare Two Arrays
• Add Object to Array
• Create Comma Separated List
• Find the Min/Max Element
• Clone an Array
• Create HTML List
• Convert String to Array
• Convert Set to Array
• Create 2D Array
• Sum Array Elements
• Create 1 to N Array
• Delete Item from Array
• Find an Item in Array
• Add Elements to Start
• Loop Through Object
• Remove Object by Property
• Move an Array Element
• Store Array in LocalStorage
• Remove Empty Elements
• Convert Byte Array to String
• Sort Numeric Array
• Find Object Index
• Change the Array Value
• Find the Most Frequent Element
• Most Frequently Element
• Map in Reverse Order
• Calculate Standard Deviation
• Find the Missing Number
• Remove Falsy Values
• Remove Min/Max Elements
• Find First Non-Repeated Element
• Find the Majority Element
• Get All Non-Unique Values
• Find Minimum Repeating Index

Hard:

The Hard level includes articles that cover more intricate and less common tasks

• Remove Duplicates from Array Objects
• Get Distinct Object Values
• Convert Object into Array Objects
• Convert Array of Objects to a Map
• Split an Array into Chunks
• Check Array for Substring
• Remove Multiple Items
• Find Second Largest
• Convert Map Keys to Array
• Group Objects by Property
• Sort Words Alphabetical
• Quick Sort
• Check Value at Index
• List Array Keys
• Find Find Target Index
• Merge Arrays In-Place
• Remove Null Objects
• Sort Array by Values
• Find Next Smaller Element
• Sort 1 to N Array
• Find Largest Subarray Divisible by K
• Find K Most Frequent
• Count Unequal Pairs
• Sparse Table
• Rotation Count
• Array from Pair Sum
• Find Union and Intersection
• Count Numbers Less or Equal
• Find Median in a Stream
• OR and AND of Elements
• Max Profit with Share
• K-th Largest Sum
• Max Distance Between Element
• Calculate Mean
• Search Rotated Array
• Range Sum Query
• Rearrange in Max-Min Form
• Transpose 2D Array
• Longest Consecutive Sequence
• Sort Array Objects by Property
• Merge Sort
• Square Root (Sqrt) Decomposition
• Rearrange Even/Odd Positions
• Shortest Distance Between Words
• Filter Array Objects in ES6
• Compare Array Objects
• Find Object Property Values
• Create Range Array
• Find Nth Smallest/Largest Element
• Store Dates in Range
• Sort Mixed Data Type Array
• Count Data Types
• Find Unique Elements from Two Arrays
• Minimum Swaps to Sort
• Reorder an Array
• Unique Values from Arrays
• Swap Variables
• Swap First and Last Elements
• Split Map Keys and Values
• Find the K-th Largest Sum
• Find Max Distance Between Element
• Unique Elements Check
• Create Intersection of Two Arrays
• Create Pre-Filled Array
• Remove Objects from Associative Array
• Ungroup Elements from Zipped Array
• Create Unique Array with Set
• Loop Through Array
• Find Top Three Elements
• Merge Two Sorted
• Find Nth Smallest/Largest Element
• Convert CSV to 2D Array
• Short Circuit forEach
• Find the Largest Subarray with Sum K
• Left Rotate by One
• Search Rotated Array
• Construct an Array from Its Pair Sum Array
• Space Optimization Using Bit Manipulations
• Construct Array from Sum
• Find Max Profit wih Share
• Find K Most Occurrences

Recommended Links:

• Interesting Facts about JavaScript Arrays
• JavaScript Array Complete Reference
• JavaScript Tutorial
• Recent articles on JavaScript