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authorMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
committerMinteck <contact@minteck.org>2023-02-23 19:34:56 +0100
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+// @flow strict
+import type { ObjMap } from './ObjMap';
+
+/**
+ * Creates a keyed JS object from an array, given a function to produce the keys
+ * for each value in the array.
+ *
+ * This provides a convenient lookup for the array items if the key function
+ * produces unique results.
+ *
+ * const phoneBook = [
+ * { name: 'Jon', num: '555-1234' },
+ * { name: 'Jenny', num: '867-5309' }
+ * ]
+ *
+ * // { Jon: { name: 'Jon', num: '555-1234' },
+ * // Jenny: { name: 'Jenny', num: '867-5309' } }
+ * const entriesByName = keyMap(
+ * phoneBook,
+ * entry => entry.name
+ * )
+ *
+ * // { name: 'Jenny', num: '857-6309' }
+ * const jennyEntry = entriesByName['Jenny']
+ *
+ */
+export default function keyMap<T>(
+ list: $ReadOnlyArray<T>,
+ keyFn: (item: T) => string,
+): ObjMap<T> {
+ return list.reduce((map, item) => {
+ map[keyFn(item)] = item;
+ return map;
+ }, Object.create(null));
+}