April 2018
Intermediate to advanced
284 pages
5h 46m
English
Content preview from Simplifying JavaScript
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| Tip 6 | Check Existence in an Array with Includes() |
In this tip, you’ll learn how to find out if a value exists in an array without checking position.
It’s easy to get so caught up in the big exciting changes in a language (such as the spread operator, which you’ll see in a moment) that you miss the small changes that simplify common tasks.
Arrays now have an easy improvement to handle a common problem: testing existence. Testing existence is an important action, and it’s crucial in everything from ternaries (Tip 18, Check Data Quickly with the Ternary Operator ), to short circuiting (Tip 19, Maximize Efficiency with Short Circuiting ), to most conditionals in general.
Testing existence with JavaScript arrays has always been a little clunky. ...
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