index in .map

[shimaore]

Hi Adam,

It would be nice if .map would provide the index value as the second argument to its callback, or that the documentation clearly states that contrarily to Array::map, the index is provided as the third argument ;)

Typically, providing the index as second argument, one could write

lines.map (line,index) => …

or

lines().map (line,index) => …

(I'm a bit unclear on what the value currently provided in the second argument to enter would be, as well, but I haven't needed it.)