1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | 5x 5x 5x 5x 2x 6x 12x 5x | import { Collection, asIterable } from './utils' import Sequence from './Sequence' function map<T, U>(collection: Collection<T>, fn: (value: T, index: number) => U) { const iterable = asIterable(collection) return new Sequence(function* () { let index = 0 for(const value of iterable) { yield fn(value, index++) } }) } export default map |