Currying

Use Cases for Currying

Creating functions that accept an unfixed number of arguments
Useful in event handling
Little functions can be reused with ease

Illustrating Ordinary Function

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

add(1,2,3)    // 6
add(1,2)      // NaN
add(1,2,3,4)  // 6 (extra arguments ignored)

Illustrating Curried Function

function curry(f) {
    return function(a) {
        return function(b) {
            return f(a, b);
        };
    };
}

function sum(a, b) {
    return a + b;
}

let curriedSum = curry(sum);
curriedSum(1)(2);  // 3

References

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