| /** |
| * Creates a keyed JS object from an array, given a function to produce the keys |
| * and a function to produce the values from each item in the array. |
| * ```ts |
| * const phoneBook = [ |
| * { name: 'Jon', num: '555-1234' }, |
| * { name: 'Jenny', num: '867-5309' } |
| * ] |
| * |
| * // { Jon: '555-1234', Jenny: '867-5309' } |
| * const phonesByName = keyValMap( |
| * phoneBook, |
| * entry => entry.name, |
| * entry => entry.num |
| * ) |
| * ``` |
| */ |
| export function keyValMap(list, keyFn, valFn) { |
| const result = Object.create(null); |
| |
| for (const item of list) { |
| result[keyFn(item)] = valFn(item); |
| } |
| |
| return result; |
| } |