[sladix]

Does someone have a <52 char solution for the counter one ?

[curveship]

(x=0)=>()=>++x

[awalGarg]

You can save one character by doing this:

(x=0)=>_=>++x

the underscore is another variable but a single variable does not require parenthesis. So instead of two chars for the two parens, you use a single char for a single letter variable. JS FTW ;)

[posterboy]

that's ascii art, not code

[sladix]

Holy crap, that's what I call refactoring !

[nikital]

One solution:

    function(c=1){return function(){return c++}}

44 characters

[Bahamut]

  i=>_=>i=-~i