curry_ex3.js

const curry = (func) => {
    const arity = func.length; // number of arguments
  
    return build = (...args) => {
        if(args.length >= arity) { // (1)
            return func(...args); // (3)
        }
        else {
            return build.bind(null, ...args); // (2)
        }
    }
}