Composing Software

Curry and Function Composition

With the dramatic rise of functional programming in mainstream JavaScript, curried functions have become common in many applications. It’s important to understand what they are, how they work, and how to put them to good use.

What is a curried function?

A curried function is a function that takes multiple arguments one at a time. Given a function with 3 parameters, the curried version will take one argument and return a function that takes the next argument, which returns a function that takes the third argument. The last function returns the result of applying the function to all of its arguments.

You can do the same thing with more or fewer parameters. For example, given two numbers, a and b in curried form, ...