August 2018
Intermediate to advanced
380 pages
10h 2m
English
Content preview from Mastering Functional Programming
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Functions in functional programming
In imperative programming, functions are used to represent the behavior of an object. In object-oriented programming, the behavior usually implies side effects. For the purposes of this book, we can understand side effects as follows—a function is side-effecting when it modifies the environment outside its own body. For example, it can have a global variable of its parent object modified, it can write a file into the filesystem, or the function can perform some web API calls over the network.
In functional programming, the understanding of functions is quite different. In functional programming, we prise purity and referential transparency. Purity means the absence of side effects. Referential transparency ...
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