| 'use strict'; |
|
|
| Object.defineProperty(exports, '__esModule', { |
| value: true, |
| }); |
| exports.groupBy = groupBy; |
|
|
| /** |
| * Groups array items into a Map, given a function to produce grouping key. |
| */ |
| function groupBy(list, keyFn) { |
| const result = new Map(); |
|
|
| for (const item of list) { |
| const key = keyFn(item); |
| const group = result.get(key); |
|
|
| if (group === undefined) { |
| result.set(key, [item]); |
| } else { |
| group.push(item); |
| } |
| } |
|
|
| return result; |
| } |