Implementing a curry function in JavaScript

If you are a functional programming enthusiast or a JavaScript or Scala developer, you might have heard about curried functions. What exactly is currying, how are they useful, how can I implement a simple curry function. Let’s take a look

Arity is the number of arguments a function expects. In JavaScript, function.length gives you the arity of the function. So, in simple words when we don’t provide arity number of arguments to a curried function, it will return you another function that expects the remaining function arguments.

We have a logger function that expects three arguments, background and font color of the message to be logged and finally the message string.

If we want to log some message we would normally do it like this

Notice how we have to pass ‘bgBlue’ in both the cases, isn't it a bit redundant especially if we intend to log messages with background blue in many places in our program. Here comes the use of a curried function.

Suppose we have a curry generator function (curry), we could do something like this

Notice how we have only passed “bgBlue” once. Now we can use the new function…

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