Dart
Dart
HTML Canvas
HTML Canvas
Redis
Redis
Bash
Bash
JavaScript
JavaScript
ES6

Generator function

function*idMaker () {
  let id = 0
  while (true) { yield id++ }
}

let gen = idMaker()
gen.next().value // → 0
gen.next().value // → 1
gen.next().value // → 2

it's complicated. See: Generators

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