Implement map helper function

[believelody]

Hi guys, I'm trying to implement a kind of map helper similar to javascript map function. So my question is how can i pass a function to an helper ?
Ideally to have something like: (map array double) where double is the function which will take each array's element.

[jaylinski]

You can take inspiration from map-helper in the handlebars-helpers package:

https://github.com/helpers/handlebars-helpers/blob/5d3405f178a9ec4c90df3c7dc07b4faf9a09dfd7/lib/array.js#L397-L428