A possible curry function in JS

curry.js

const curry = fn => {
    const arity = fn.length;
    const _curry = (...args) =>
        args.length === arity
            ? fn(...args)
            : arg => _curry(...args, arg);
    return _curry();
}


// My first version before refactoring:
const curry = fn => {
    const arity = fn.length;
    const _curry = array => { 
        // I call the function when having all the arguments
        if (array.length == arity) 
            return fn(...array);
        // I create a function with only one argument
        else
            return arg => _curry(array.concat(arg));
    }
    return _curry([]);
}