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Learning JavaScript Data Structures and Algorithms - Third Edition
book

Learning JavaScript Data Structures and Algorithms - Third Edition

by Loiane Avancini
April 2018
Beginner to intermediate content levelBeginner to intermediate
426 pages
10h 19m
English
Packt Publishing
Content preview from Learning JavaScript Data Structures and Algorithms - Third Edition

Creating and initializing arrays

Declaring, creating, and initializing an array in JavaScript is really simple, as the following shows:

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

We can simply declare and instantiate a new array 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}). A third option would be passing the array elements directly to its constructor (line {3}).

However, using the new keyword is not considered best practice. If we want to create an array in JavaScript, we can assign empty brackets ([]), as in the ...

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Learning JavaScript Data Structures and Algorithms

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Loiane Avancini

Publisher Resources

ISBN: 9781788623872Supplemental Content