Add a few Stdlib helpers

[DZakh]

• String.capitalize
• String.isEmpty
• Dict.size
• Dict.isEmpty
• Array.isEmpty
• Map.isEmpty
• Set.isEmpty

Let me know if I need to cherry-pick some changes.

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commit: 9b6e506

[zth]

I like these. @cknitt what do you think?

@DZakh could you rebase?

[cknitt]

I like these. @cknitt what do you think?

Certainly useful, my only concern is that Dict.size and Dict.empty sort of hide their performance implications (array allocation, O(n)).

Actually they could be implemented without the array allocation:

function size(dict) {
  let count = 0;
  for (let key in dict) {
    if (dict.hasOwnProperty(key)) count++;
  }
  return count;
}