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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | 1x 1x 1x 3x 4x 1x 1x 1x 2x 2x 2x | import { flatten } from './flatten'; import { purry } from './purry'; /** * Map each element of an array using a defined callback function and flatten the mapped result. * @param array The array to map. * @param fn The function mapper. * @signature * R.flatMap(array, fn) * @example * R.flatMap([1, 2, 3], x => [x, x * 10]) // => [1, 10, 2, 20, 3, 30] * @data_first * @pipeable * @category Array */ export function flatMap<T, K>(array: T[], fn: (input: T) => K | K[]): K[]; /** * Map each element of an array using a defined callback function and flatten the mapped result. * @param array The array to map. * @param fn The function mapper. * @signature * R.flatMap(fn)(array) * @example * R.pipe([1, 2, 3], R.flatMap(x => [x, x * 10])) // => [1, 10, 2, 20, 3, 30] * @data_last * @pipeable * @category Array */ export function flatMap<T, K>(fn: (input: T) => K | K[]): (array: T[]) => K[]; export function flatMap() { return purry(_flatMap, arguments, flatMap.lazy); } function _flatMap<T, K>(array: T[], fn: (input: T) => K[]): K[] { return flatten(array.map(item => fn(item))); } export namespace flatMap { export function lazy<T, K>(fn: (input: T) => K | K[]) { return (value: T) => { const next = fn(value); Eif (Array.isArray(next)) { return { done: false, hasNext: true, hasMany: true, next: next, }; } return { done: false, hasNext: true, next, }; }; } } |