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Learning JavaScript Data Structures and Algorithms

You're reading from   Learning JavaScript Data Structures and Algorithms JavaScript Data Structures and algorithms can help you solve complex development problems – learn how by exploring a huge range of JavaScript data types

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Product type Paperback
Published in Oct 2014
Publisher Packt
ISBN-13 9781783554874
Length 218 pages
Edition 1st Edition
Languages
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Author (1):
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Loiane Avancini Loiane Avancini
Author Profile Icon Loiane Avancini
Loiane Avancini
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Toc

Creating and initializing arrays

Declaring, creating, and initializing an array in JavaScript is as simple, as follows:

var daysOfWeek = new Array(); //{1}
var daysOfWeek = new Array(7); //{2}
var daysOfWeek = new Array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'); //{3}

We can simply declare and instantiate a new array by using the keyword new (line {1}). Also, using the keyword new, we can create a new array specifying the length of the array (line {2}). And a third option would be passing the array elements directly to its constructor (line {3}).

However, using the new keyword is not a best practice. If you want to create an array in JavaScript, simply use brackets ([]) like in the following example:

var daysOfWeek = [];

We can also initialize the array with some elements, as follows:

var daysOfWeek = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', &apos...
You have been reading a chapter from
Learning JavaScript Data Structures and Algorithms
Published in: Oct 2014
Publisher: Packt
ISBN-13: 9781783554874
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