What are some examples of pure functions in libraries?

What are some examples of pure functions in libraries?

Pure functions are functions that always produce the same output for the same input and have no side effects. Examples include functions like map, filter, and reduce in JavaScript libraries.

Can you explain how the map function is a pure function?

Sure! The map function takes an array and a callback function, applies the callback to each element, and returns a new array. It doesn't modify the original array, making it a pure function.

What about the filter function?

The filter function creates a new array with all elements that pass the test implemented by the provided function. Like map, it does not change the original array, ensuring it is pure.

Are there pure functions in other programming languages?

Yes, many programming languages have similar concepts. For example, in Python, functions like filter() and map() are also considered pure functions.