Defaultdict equivalent in javascript

Question

In python you can have a defaultdict(int) which stores int as values. And if you try to do a \'get\' on a key which is not present in the dictionary you get zero as default

Answer 1

To add to Andy Carlson's answer

If you default dict an array, you'll get a toJSON field in the resulting object. You can get rid of it by deconstructing to a new object.

const dd = new DefaultDict(Array);
//...populate the dict
return {...dd};