By Sam Deering

Declare Arrays in jQuery

By Sam Deering

Simple  JavaScript code snippets to delare an array. Like other JavaScript variables, you do not have to declare arrays before you can use them. I like to declare them just so I can easily read whats going on, it’s a good practice!

Example 1 – Array Constructor

// Declare an array (using the array constructor)
var arlene1 = new Array();
var arlene2 = new Array("First element", "Second", "Last");


Example 2 – Literal notatoin

// Declare an array (using literal notation)
var arlene1 = [];
var arlene2 = ["First element", "Second", "Last"];

Example 3 – Implicit Declaration

// Create an array from a method's return value
var carter = "I-learn-JavaScript";
var arlene3 = carter.split("-");

To avoid script errors, you should get into the habit of initializing an array when you declare it, like so:

// Declare an empty array using literal notation:
var arlene = [];
// The variable now contains an array of length zero

After checking my code on I found out it says declaring an array with an array constructor is seen as bad practise! It suggests using literal notation.

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