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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

Using the from method

The Array.from method creates a new array from an existing one. For example, if we want to copy the array numbers into a new one, we can use the following code:

let numbers2 = Array.from(numbers); 

It is also possible to pass a function so that we can determine which values we want to map. Consider the following code:

let evens = Array.from(numbers, x => (x % 2 == 0)); 

The preceding code created a new array named evens, and a value true if in the original array the number is even, and false otherwise.

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Learning JavaScript Data Structures and Algorithms

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Publisher Resources

ISBN: 9781788623872Supplemental Content