January 2020
Intermediate to advanced
470 pages
11h 13m
English
Content preview from Mastering JavaScript Functional Programming - Second Edition
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Logical higher-order functions
Up to now, we have been using higher-order functions to produce new results, but there are also some other functions that produce logical results by applying a predicate to all the elements of an array. (By the way, we'll be seeing much more about higher-order functions in the next chapter.)
A bit of terminology: the word predicate can be used in several senses (as in predicate logic), but for us, in computer science, it has the meaning of a function that returns true or false. Okay, this isn't a very formal definition, but it's enough for our needs. For example, saying that we will filter an array depending on a predicate just means that we get to decide which elements are included or excluded depending on ...
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