In this article, we will discuss what currying is, how it works, and how you can use it to simplify your code.
Currying is a technique in functional programming where a function that takes multiple arguments is transformed into a series of functions that take one argument each. The resulting functions can then be composed together to create more complex functions.
To illustrate this, let’s take a simple example of a function that adds two numbers:
With currying, we can transform this function into a series of functions that take one argument each:
Now, we can use this curried function to add two numbers like this:
In this example, we first call the add function with the first argument 1 and store the resulting function in addOne. Then, we call addOne with the second argument 2 to get the sum 3.
Currying can be used in various scenarios, such as:
Creating reusable functions: Currying allows you to create functions that can be easily reused with different arguments.
Partial application: With currying, you can partially apply a function with some arguments and reuse the resulting function with the remaining arguments.
Function composition: You can compose multiple functions together using currying to create more complex functions.
Here’s an example of how you can use currying to create a function that adds multiple numbers:
In this example, we create a curried add function that takes one argument x and returns a function that takes another argument y. If y is undefined, we return the sum of all the previous arguments. Otherwise, we return a new curried add function with the sum of the previous arguments and the current argument.