8 Concepts to Make You Code Truly Pure Functions in JavaScript
As you would do in a functional programming language
Pure functions behave identically to mathematical functions and give you diverse benefits. It is considered to be one if it matches two conditions:
- Given the same arguments, the function always calculates and returns the same result.
- When calculating its result, the function doesn’t cause any observable side effects.
Summing it up to a memorizable sentence:
Pure functions don’t depend on, and don’t modify, anything outside their scope, and do always return the same result for the same input arguments.
You might also be reminded about a software design principle that is really important in the context of pure functions.
A function should do one thing, only one thing, and nothing but that thing.
If a function does more than one thing and has some hidden functionality, you won’t predict the function’s output. Hence makes things harder for you as a developer.
Pure Functions Do This the Best
The major advantage of working with pure functions is their lack of side effects. Calling them means not to worry about…
