How can I use currying to transform a function with multiple arguments in JavaScript?

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How can I use currying to transform a function with multiple arguments in JavaScript?

Asked on Dec 20, 2025

Answer

Currying is a functional programming technique that transforms a function with multiple arguments into a sequence of functions, each taking a single argument. This allows for more flexible and reusable function calls.

<!-- BEGIN COPY / PASTE -->
        function curry(fn) {
            return function curried(...args) {
                if (args.length >= fn.length) {
                    return fn.apply(this, args);
                } else {
                    return function(...nextArgs) {
                        return curried.apply(this, args.concat(nextArgs));
                    };
                }
            };
        }

        function add(a, b, c) {
            return a + b + c;
        }

        const curriedAdd = curry(add);

        console.log(curriedAdd(1)(2)(3)); // Output: 6
        console.log(curriedAdd(1, 2)(3)); // Output: 6
        console.log(curriedAdd(1)(2, 3)); // Output: 6
        <!-- END COPY / PASTE -->

Additional Comment:

The "curry" function takes a function "fn" as an argument and returns a new function "curried".
"curried" checks if the number of arguments is sufficient to call "fn". If so, it calls "fn" with those arguments.
If not, it returns another function to collect more arguments.
The "add" function is an example of a function that can be curried.
"curriedAdd" demonstrates how the curried function can be called with different combinations of arguments.

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How can I use currying to transform a function with multiple arguments in JavaScript?

Asked on Dec 20, 2025

Answer

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