You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31 lines
779 B
31 lines
779 B
// @flow strict
|
|
import type { ObjMap } from './ObjMap';
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* 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 default function keyValMap<T, V>(
|
|
list: $ReadOnlyArray<T>,
|
|
keyFn: (item: T) => string,
|
|
valFn: (item: T) => V,
|
|
): ObjMap<V> {
|
|
return list.reduce((map, item) => {
|
|
map[keyFn(item)] = valFn(item);
|
|
return map;
|
|
}, Object.create(null));
|
|
}
|