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Frequently Asked Questions

How do I create an array in JavaScript?

Creating arrays in JavaScript is easy with the array literal notation. It consists of two square brackets that wrap optional array elements separated by a comma. Array elements can be any type, including number, string, Boolean, null, undefined, object, function, regular expression and other arrays.

How to create array of integers in JavaScript?

You can also use the new keyword to create array of integers in JavaScript − var rank = new Array (1, 2, 3, 4); The Array parameter is a list of strings or integers. When you specify a single numeric parameter with the Array constructor, you specify the initial length of the array.

What is an array index in JavaScript?

Accessing array elements. JavaScript arrays are zero-indexed: the first element of an array is at index 0, and the last element is at the index equal to the value of the array's length property minus 1. Using an invalid index number returns undefined.


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