What are Curry functions in JavaScript

Currying is a technique of evaluating function with multiple arguments, into sequence of function with single argument. That is, when we turn a function call add(1,2,3) into curriedAdd(1)(2)(3) .

function curriedAdd(x) {
    return function(y) {
        return function(z) {
            return x + y + z;
        };
    }
}

curriedAdd(1)(2)(3)  // result would be 6

let curriedAdd_1_2 = curriedAdd(1)(2);
curriedAdd_1_2(3) // result would be 6
curriedAdd_1_2(10) // result would be 13

References

• Currying in JavaScript
• The Rise and Fall and Rise of Functional Programming
• Currying the callback, or the essence of futures…