Is it possible to do something like this in Javascript?

I have questions
1

Hi all!

const
  Whitespace = {' ', '\t', '\v', '\c', '\n', '\f'},
  Digits = {'0'..'9'},
  DigitsWithSep = Digits + {'.', ',', '_'},
  OpChars = ['^', '/', '*', '-', '+'],

Is it possible to do something like this in Javascript?

Notes

  1. I'm creating a parser of a text
  2. I would like to know if it is possible to do something like this in Javascript, curiosity question
  3. I would be happy if someone would read and answer my question. ;D
2

What would that do, exactly?

You can do:

const Whitespace= = new Set([' ', '\t', '\v', '\c', '\n', '\f']);
const Digits = Array.from({ length: 9 }, (_, i) => i);
const DigitsWithSep = Digits.concat('.', ',', '_');

const OpChars = new Set(['^', '/', '*', '-', '+']);```
etc, though.
1 Like
3

That hurts my eyes. I'd like to see Number.range() get some traction to help out there.

1 Like
4

If arrays work (as opposed to sets), then this would work as well:

const
  Whitespace = [' ', '\t', '\v', '\c', '\n', '\f'],
  Digits = [...'0123456789'],
  DigitsWithSep = [ ...Digits, '.', ',', '_'],
  OpChars = ['^', '/', '*', '-', '+'],
2 Likes
5

@theScottyJam @senocular @ljharb thank you all for feedback!

6

I'm currently waiting for the Iterator Helpers proposal to move forward :eyes:

2 Likes