Using an array literal is the easiest way to create a JavaScript Array. Syntax: const array_name = [item1, item2, ...]; It is a common practice to declare arrays with the const keyword. Learn more about const with arrays in the chapter: JS Array Const. Spaces and line breaks are not important. A declaration can span multiple lines:

If you are creating an array whose main feature is it's length, rather than the value of each index, defining an array as var a=Array(length); is appropriate. eg- String.prototype.repeat= function(n){ n= n || 1; return Array(n+1).join(this); }

Jun 4, 2014 · In JavaScript, when you declare an array, the default value is undefined as it can hold anything, number, string, any object (including another array). All elements of a JavaScript array don't have to be the same type.

Oct 22, 2024 · There are varous ways to declare arrays in JavaScript, but the simplest and common is Array Litral Notations. The basic method to declare an array is using array litral notations. Use square bracket [] to declare an array and enclose comma-separated elements for initializing arrays.

Oct 24, 2012 · Declare the variable and create an array: var v; v = new Array(5); Or as a single statement: var v = new Array(5); The preferred way of creating arrays is using new Array when you want to specify a size, and an array literal when you want to create an array from items:

Apr 3, 2025 · JavaScript arrays are not associative arrays and so, array elements cannot be accessed using arbitrary strings as indexes, but must be accessed using nonnegative integers (or their respective string form) as indexes.

Mar 13, 2022 · There are two ways to declare an empty array object in JavaScript. One is to create a literal with brackets, and the other is to instantiate an array with the new array() constructor method. This is how to create a literal with brackets:

Feb 10, 2025 · Recognizing a JavaScript Array. There are two methods by which we can recognize a JavaScript array: By using Array.isArray() method; By using instanceof method ; Below is an example showing both approaches: JavaScript

JavaScript allows declaring an Array in several ways. Let's consider two most common ways: the array constructor and the literal notation. The Array () constructor creates Array objects. You can declare an array with the "new" keyword to instantiate the array in memory. Here’s how you can declare new Array () constructor:

Nov 14, 2022 · There are two standard ways to declare an array in JavaScript. These are either via the array constructor or the literal notation. In case you are in a rush, here is what an array looks like declared both ways: // Using array constructor let array = new array("John Doe", 24, true); // Using the literal notation let array = ["John Doe", 24, true];