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Suggestion: Range as Number type

See original GitHub issue

When defining a type one can specify multiple numbers separated by |.

type TTerminalColors = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15;

Allow to specify number types as ranges, instead of listing each number:

type TTerminalColors = 0..15;
type TRgbColorComponent = 0..255;
type TUInt = 0..4294967295;

Maybe use .. for integers and ... for floats.

interface Math {
  random(): 0...1

type RandomDice = 1..6;

const roll: RandomDice = Math.floor(Math.random() * 6);
// Error: -------------------------^ Maybe use Math.ceil()?

Issue Analytics

  • State:open
  • Created 6 years ago
  • Reactions:1389
  • Comments:145 (33 by maintainers)

github_iconTop GitHub Comments

panuhorsmalahticommented, Aug 18, 2017

This idea can be expanded to characters, e.g. "b".."d" would be "b" | "c" | "d". It would be easier to specify character sets.

jcreadycommented, Aug 20, 2017

@aluanhaddad actually it would be far from infinite in IEEE floating point. It would have 1,065,353,217 inhabitants by my calculations.

Read more comments on GitHub >

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