'use strict'; const curry = (fx) => { const arity = fx.length; return function f1() { const args = [...arguments]; if (args.length >= arity) { return fx.apply(null, args); } else { return function f2() { const args2 = [...arguments]; return f1.apply(null, args.concat(args2)); } } }; }; const add = curry((x, y, z) => x + y + z); const add2 = add(2); console.log(add2(4)(4));