What is pure function?
A function that always returns the same output given the same inputs and has no side effects
pure function explained in plain English
Analogy
A pure function is like a calculator - you put in a number, and it gives you an answer based on that number alone, without changing any other numbers or affecting the outside world
Example
A simple example of a pure function is a function that takes a person's age as input and returns their eligibility to vote, based solely on their age
How is pure function used?
Pure functions are used in programming to make code more reliable, testable, and reusable, as they can be easily composed and predicted
Common misconceptions about pure function
Some people think that pure functions are only used in functional programming, but they can be used in any programming paradigm to improve code quality
History
The concept of pure functions originated in the field of functional programming, where it was recognized as a key principle for writing composable and predictable code
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