Currying

_Currying.md

Currying

A curried function takes a single argument and returns another function that takes the next argument until it can evaluate to a result.

Example implementation

• lodash#curry

example.js

const _ = require('lodash');

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

const _add = _.curry(add);

_add(1);                // function
_add(1)(2);             // 3
_add(1)(2)(3);          // TypeError
_add(_add(1)(2), 3)     // 6

// Infinite currying
function addInfinite (total) {
    var sum = function (...nums) {
        const _sum = nums.reduce((acc, num) => acc + num, total);
        return addInfinite(_sum);
    }

    sum.valueOf = function () {
        return total;
    };

    return sum;
}

addInfinite(1);             // { [Number: 1] valueOf: [Function] }
addInfinite(1)(2);          // { [Number: 3] valueOf: [Function] }
addInfinite(1)(2)(3);       // { [Number: 6] valueOf: [Function] }
0 + addInfinite(1)(2)(3);   // 6