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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 61 62 63 64 65 66 67 68 69 70 71 | 8x 8x 4x 24x 8x 8x 8x 24x 24x 40x 28x 40x 24x 8x 24x 8x 16x 8x 8x 8x 4x | import { purry } from './purry';
import { PredIndexedOptional, PredIndexed } from './_types';
/**
* Splits a collection into sets, grouped by the result of running each value through `fn`.
* @param items the items to group
* @param fn the grouping function
* @signature
* P.groupBy(array, fn)
* @signature
* P.groupBy(fn)(array)
* @example
* P.groupBy(['one', 'two', 'three'], x => x.length) // => {3: ['one', 'two'], 5: ['three']}
* P.pipe(['one', 'two', 'three'], P.groupBy(x => x.length)) // => {3: ['one', 'two'], 5: ['three']}
* @category Array, Pipe
*/
export function groupBy<T, K extends keyof any>(
items: readonly T[],
fn: (item: T) => K | ReadonlyArray<K>
): Record<K, T[]>;
export function groupBy<T, K extends keyof any>(
fn: (item: T) => K | ReadonlyArray<K>
): (array: readonly T[]) => Record<K, T[]>;
export function groupBy() {
return purry(_groupBy(false), arguments);
}
function isArray<T>(
data: T
): data is Extract<T, Array<any> | ReadonlyArray<any>> {
return Array.isArray(data);
}
const _groupBy = (indexed: boolean) => <T, K extends keyof any>(
array: T[],
fn: PredIndexedOptional<T, K | ReadonlyArray<K>>
) => {
const ret: Record<keyof any, T[]> = {};
array.forEach((item, index) => {
const value = indexed ? fn(item, index, array) : fn(item);
const addToGroup = (key: K, value: T) => {
if (!ret[key]) {
ret[key] = [];
}
ret[key].push(value);
};
if (isArray(value)) {
value.forEach(key => {
addToGroup(key, item);
});
return;
}
addToGroup(value, item);
});
return ret;
};
export namespace groupBy {
export function indexed<T, K extends keyof any>(
array: readonly T[],
fn: PredIndexed<T, K | ReadonlyArray<K>>
): Record<K, T[]>;
export function indexed<T, K extends keyof any>(
fn: PredIndexed<T, K | ReadonlyArray<K>>
): (array: readonly T[]) => Record<K, T[]>;
export function indexed() {
return purry(_groupBy(true), arguments);
}
}
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