Best way to flatten JS object (keys and values) to a single depth array

Question

I have written this small function to get all keys and values of an object and store them into an array. The object might contain arrays as values...

Object {

Answer 1

You could just concat all keys and values. (It does not solve the type casting to number for keys.)

var object =  { 0: [1, 2, 3, 4] },
    result = Object.keys(object).reduce(function (r, k) {
        return r.concat(k, object[k]);
    }, []);
    
console.log(result);