JavaScript Array Programming Examples

JavaScript array is used to store multiple elements in a single variable. It is often used when we want to store a list of elements and access them by a single variable. Unlike most languages where the array is a reference to the multiple variables, in JavaScript, an array is a single variable that stores multiple elements.

Syntax:

let array = [value1, value2, ...];
let array = new Array();

Example 1: Here is the basic example of an array in javascript.

Javascript

// Declaring an array using Literal Notation
let language = ["HTML","CSS","Javascript"]
console.log(language)

Output:

['HTML', 'CSS', 'Javascript']

Example 2: In this example, we are using a new keyword.

Javascript

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

Output:

['HTML', 'CSS', 'Javascript']

The following section contains a wide collection of javascript Array examples. Many of these program examples offer different ways to handle the issue.

Javascript Array Question:

1	Create an Array of Given Size in JavaScript
2	How to Initialize an Array in JavaScript ?
3	Ways of Iterating Over an Array in JavaScript
4	Most Efficient Way to Create a Zero Filled Array in JavaScript
5	JavaScript Program to Create an Array with a Specific Length and Pre-filled Values
6	How to Check if an Array includes a Value in JavaScript?
7	JavaScript Program to Access Elements in an Array
8	JavaScript Program to Determine the Length of an Array
9	Check if an Element is Present in an Array using JavaScript
10	JavaScript Program to Swap First and Last Elements in an Array
11	Different Ways to Populate an Array in JavaScript
12	JavaScript Program to Delete Middle Element from an Array
13	Different Ways to Delete an Item from an Array using JavaScript
14	Copy Array Items into Another Array in JavaScript
15	How to Copy Array by Value in JavaScript ?
16	How to Clone an Array in JavaScript ?
17	How to Fill an Array with Given Value in JavaScript ?
18	JavaScript Program to Create an Array of Unique Values From Multiple Arrays Using Set Object
19	Create Array of Integers Between Two Numbers Inclusive in JavaScript
20	How to Find the Array Index with a Value in JavaScript ?
21	JavaScript Program to find the Nth smallest/largest element from an unsorted Array
22	How to Add Elements to the End of an Array in JavaScript ?
23	JavaScript Program to Find Second Largest Element in an Array
24	JavaScript Program to Find the Largest Three Elements in an Array
25	Javascript Program to Find the Largest Element in an Array
26	JavaScript Program to Find Next Smaller Element
27	JavaScript Program to Check if an Array Contains only Unique Values
28	How to create an array containing 1…N numbers in JavaScript ?
29	JavaScript Program to Reorder an Array According to Given Indexes
30	How to Check a Value Exist at Certain Array Index in JavaScript ?
31	JavaScript Program to Find the Missing Number in a Given Integer Array of 1 to 100
32	JavaScript Program to Find the Most Frequent Element in an Array
33	JavaScript Program to Construct an Array from its pair-sum Array
34	Best Way to Find an Item in an Array in JavaScript
35	How to Calculate the Cumulative Sum of Elements in an Array using JavaScript ?
36	JavaScript Program to Find Index of First Occurrence of Target Element in Sorted Array
37	JavaScript Program to Check an Array is Sorted or Not
38	How to Remove Smallest and Largest Elements from an Array in JavaScript ?
39	How to Create an Array of Cumulative Sum in JavaScript ?
40	How to Change Values in an Array when Doing foreach Loop in JavaScript ?
41	How to get first N number of elements from an array in JavaScript ?
42	What is the most efficient way to concatenate N arrays in JavaScript ?
43	How to merge two arrays and remove duplicate items in JavaScript ?
44	How to Merge/Flatten an array of arrays in JavaScript ?
45	Different ways to search an item in an array in JavaScript
46	Count occurrences of all items in an array in JavaScript
47	Count Frequency of an Array Item in JavaScript
48	Javascript program for counting frequencies of array elements
49	How to Create an Array using Intersection of two Arrays in JavaScript ?
50	Reverse an array in JavaScript
51	Creating a Zero-Filled Array in JavaScript
52	How to find the sum of all elements of a given array in JavaScript ?
53	Calculate the length of an associative array using JavaScript
54	How to Remove duplicate elements from array in JavaScript ?
55	How to filter out the non-unique values in an array using JavaScript ?
56	How to remove elements of a given array until the passed function returns true in JavaScript ?
57	How to remove specific elements from the left of a given array of elements using JavaScript ?
58	How to count number of occurrences of repeated names in an array of objects in JavaScript ?
59	How to remove falsy values from an array in JavaScript ?
60	How to move specified number of elements to the end of an array in JavaScript ?
61	How to flatten a given array up to the specified depth in JavaScript ?
62	How to get the standard deviation of an array of numbers using JavaScript ?
63	How to get symmetric difference between two arrays in JavaScript ?
64	How to get n largest elements from array in JavaScript ?
65	How to find every element that exists in any of two given arrays once using JavaScript ?
66	Find all elements in a array except for the first one using JavaScript ?
67	How to remove n elements from the end of a given array in JavaScript ?
68	How to create an object from two arrays in JavaScript?
69	How to create a string by joining the elements of an array in JavaScript ?
70	How to splice an array without mutating the original Array?
71	Swapping two array elements in a single line using JavaScript
72	How to create HTML list from JavaScript array ?
73	How to get the same value from another array and assign to object of arrays ?
74	JavaScript Program to Sort Words in Alphabetical Order
75	JavaScript Program to Sort an Array which Contain 1 to n Values
76	JavaScript Program to find the Longest Consecutive Sequence of Numbers in an Array
77	How to create an array containing non-repeating elements in JavaScript ?
78	How to print unique elements from two unsorted arrays using JavaScript ?
79	How to remove Objects from Associative Array in JavaScript ?
80	JavaScript Program to Rearrange Array such that Even Positioned are Greater than Odd
81	JavaScript Program to Merge two Sorted Arrays into a Single Sorted Array
82	JavaScript Program to Determine the Frequency of Elements in an Array and Represent it as an Object
83	Difference between sorting string array and numerical array
84	How to loop through an array containing multiple objects and access their properties in JavaScript ?
85	How to create an array of partial objects from another array in JavaScript ?
86	How to create an array of objects from multiple arrays in JavaScript ?
87	How to group objects in an array based on a common property into an array of arrays in JavaScript ?
88	How to modify an object’s property in an array of objects in JavaScript ?
89	How to create an array of elements, ungrouping the elements in an array produced by zip in JavaScript ?
90	Convert an array of objects to a CSV string that contains only the columns specified using JavaScript
91	How to use arrays to swap variables in JavaScript ?
92	How to fill static values in an array in JavaScript ?
93	What are the Important Array Methods of JavaScript ?
94	How to filter an array of objects in ES6 ?
95	How to remove duplicate elements from JavaScript Array ?
96	Difference between Array and Array of Objects in JavaScript
97	Difference between forEach() and map() loop in JavaScript
98	JavaScript Program to Rearrange Array Alternately
99	JavaScript Program for the Minimum Index of a Repeating Element in an Array
100	How to convert CSV string file to a 2D array of objects using JavaScript ?
101	JavaScript Program to find Smallest Difference Triplet from Three Arrays
102	JavaScript Program to Find Shortest Distance Between Two Words in an Array of Words
103	JavaScript Program to find the Index of Last Occurrence of Target Element in Sorted Array
104	How to filter values from an array for which the comparator function does not return true in JavaScript ?
105	How many numbers in the given array are less/equal to the given value using the percentile formula ?
106	What’s the difference between toArray and makeArray in jQuery ?
107	How to convert a 2D array to a comma-separated values (CSV) string in JavaScript ?
108	Best-Known JavaScript Array Methods
109	How to truncate an array in JavaScript ?
110	How to print object by id in an array of objects in JavaScript ?
111	How to convert a number into array in JavaScript ?
112	How to use Array.prototype.reduce() method in JavaScript ?
113	How to convert two-dimensional array into an object in JavaScript ?
114	How to count number of data types in an array in JavaScript ?
115	How to transform a JavaScript iterator into an array ?
116	How to add elements to an existing array dynamically in JavaScript ?
117	How to search the max value of an attribute in an array object ?
118	How to move an array element from one array position to another in JavaScript?
119	How to detect the duplication of values of input fields ?
120	How to call the map method only if the element is an array?
121	Dense and Sparse Array in JavaScript
122	Remove Array Element Based on Object Property in JavaScript
123	Short Circuit Array.forEach Like Calling Break
124	Sort array of objects by single key with date value in JavaScript
125	Check an array of strings contains a substring in JavaScript
126	How to extend an existing array with another array without creating a new array in JavaScript ?
127	Set vs Array in JavaScript
128	How to access and process nested objects, arrays, or JSON ?
129	Is JavaScript Array Sort Stable ?
130	How to store an array in localStorage ?
131	How to Sort Numeric Array using JavaScript ?
132	Find the OR and AND of Array elements using JavaScript
133	Find all the combinations of the array values in JavaScript
134	How to use map() on an array in reverse order with JavaScript ?
135	How to convert Integer array to String array using JavaScript ?
136	How to make Array.indexOf() case insensitive in JavaScript ?
137	How to sort an array of object by two fields in JavaScript ?
138	Remove elements from a JavaScript Array
139	How to convert an Object {} to an Array [] of key-value pairs in JavaScript?
140	How to check whether an array is subset of another array using JavaScript ?
141	How to compute union of JavaScript arrays ?
142	How to find the index of all occurrence of elements in an array using JavaScript ?
143	How to compare two JavaScript array objects using jQuery/JavaScript ?
144	How to remove multiple elements from array in JavaScript ?
145	How to remove duplicates from an array of objects using JavaScript ?
146	How to select a random element from array in JavaScript ?
147	How to store all dates in an array present in between given two dates in JavaScript ?
148	How to unpack array elements into separate variables using JavaScript ?
149	How to select Min/Max dates in an array using JavaScript ?
150	Get the Difference between Two Sets using JavaScript
151	How to replace an item from an array in JavaScript ?
152	How to check all values of an array are equal or not in JavaScript ?
153	How to convert Map keys to an array in JavaScript ?
154	How to add an object to an array in JavaScript ?
155	How to get a list of associative array keys in JavaScript ?
156	Convert comma separated string to array using JavaScript
157	Max/Min value of an attribute in an array of objects in JavaScript
158	How to find if two arrays contain any common item in Javascript ?
159	Remove the last item from an array in JavaScript
160	Find the min/max element of an Array using JavaScript
161	Delete the array elements in JavaScript | delete vs splice
162	Split an array into chunks in JavaScript
163	How to get character array from string in JavaScript ?
164	How to convert Set to Array in JavaScript ?
165	Convert an Array to an Object in JavaScript
166	How to insert an item into array at specific index in JavaScript ?
167	Create a comma separated list from an array in JavaScript
168	JavaScript Get all non-unique values from an array
169	Sort an Object Array by Date in JavaScript
170	How to use loop through an array in JavaScript ?
171	How to get all unique values (remove duplicates) in a JavaScript array?
172	How to compare two arrays in JavaScript ?
173	Get the first and last item in an array using JavaScript
174	How to check if a variable is an array in JavaScript?
175	Remove empty elements from an array in JavaScript
176	How to empty an array in JavaScript ?
177	Add new elements at the beginning of an array using JavaScript
178	JavaScript Program to Split Map Keys and Values into Separate Arrays
179	How to remove an element from an array in JavaScript?
180	How to append an element in an array in JavaScript ?
181	Implementation of Array class in JavaScript
182	How to Convert Byte Array to String in JavaScript ?
183	How to Get the Difference Between Two Arrays in JavaScript ?
184	JavaScript Program to Sort an Associative Array by its Values
185	Map to Array in JavaScript
186	String to Array in JavaScript
187	How to Sort an Array using JavaScript when Array Elements has Different Data Types ?
188	Destructive vs Non-Destructive Approach in JavaScript Arrays
189	JavaScript Program for Left Rotate by One in an Array
190	JavaScript Program to Convert Byte Array to JSON
191	Find the Rotation Count in Rotated Sorted array in JavaScript
192	Converting JavaScript Arrays into CSVs and Vice-Versa
193	JSON Modify an Array Value of a JSON Object
194	JavaScript Program for Finding the Majority Element of an Array
195	JavaScript Program to Find k Most Occurrences in the Given Array
196	What are Associative Arrays in JavaScript ?
197	JavaScript Program to Count Unequal Element Pairs from the Given Array
198	JavaScript Program to Find Union and Intersection of Two Unsorted Arrays
199	JavaScript Program to Find Largest Subarray with a Sum Divisible by k
200	JavaScript Program to Find the First Non-Repeated Element in an Array
201	JavaScript Program to Convert an Array into a String
202	JavaScript Program to Find Median in a Stream of Integers (running integers) using Array
203	JavaScript Progam to rearrange an array in maximum minimum form using Two Pointer Technique
204	JavaScript Program to Find Index of an Object by Key and Value in an Array
205	Sparse Table Using JavaScript Array
206	JavaScript Program to Merge Two Arrays Without Creating a New Array
207	JavaScript Program for K-th Largest Sum Contiguous Subarray
208	JavaScript Program to Find the Most Frequently Occurring Element in an Array
209	Map() vs Filter() in Javascript
210	JavaScript Program to Find Maximum Profit by Buying and Selling a Share at Most Twice using Array
211	How does Array.prototype.slice.call work in JavaScript ?
212	Square Root (Sqrt) Decomposition Algorithm Using JavaScript Array
213	Prevention from getting error by adding script tag anywhere using DOMContentLoaded Event Listener of JavaScript
214	Arrays in JavaScript behaves like an Object
215	How to extract value of a property as array from an array of objects ?
216	How to get distinct values from an array of objects in JavaScript?
217	How to pass array in another array of objects?
218	How to sort an array of objects by property values ?
219	How to Declare Two Dimensional Empty Array in JavaScript ?
220	How to create two dimensional array in JavaScript ?
221	JavaScriptProgram to Check Two Matrices are Identical or Not
222	JavaScript Program to Find Sum of elements in a Matrix
223	Transpose a two dimensional (2D) array in JavaScript
224	JavaScript Program for Selection Sort
225	JavaScript Program for Insertion Sort
226	JavaScript Program for Merge Sort
227	JavaScript Program for Quick Sort
228	Shell Sort Visualizer using JavaScript

We have a complete list of Javascript Array functions, to check those please go through this JavaScript Array Complete Reference article.

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