Using underscore.js can reduce return an array?

Question

I'm trying to use reduce to return an array like so:

var myArray = [1,2,3];
_.reduce(myArray, function (seed, item) { return seed.push(item);}, []);

I expect that it will produce an array just like myArray. Instead for the first item, seed is an array. Then for the second item, seed is a number. That causes an error and the third item is never reached.

Whats happening here?

Answer 1

Actually, seed.push() does not return the modified seed. Do the following, and it's right:

_.reduce(myArray, function (seed, item) { seed.push(item); return seed; }, []);