a function to currify another function

curry.js

/**
 * @param {Function} fn - The function wanted to be currified
 * @return {Function} a currified function
 */
function curry(fn) {
    return curryHelper(fn);
}

// private helper, not expose to client
function curryHelper(fn, memory = [], ...args) {
    const local = memory.concat(args);
    if(local.length >= fn.length)
        return fn(...local);
    else
        return curry.bind(null, fn, local);
}

/* test on browser console:
function test(a, b, c) {
    console.log(a, b, c)
}

var x = curry(test)('I','am');
var y1 = x('Yamada');
var y2 = x('Aoi');
// I am Yamada
// I am Aoi

var m = curry(test)('I');
var n1 = m('love');
var n2 = m('also love');

var o1 = n1('cats');
var o2 = n1('dogs');

var o3 = n2('*****');
// I love cats
// I love dogs
// I also love *****

 */