Revamp toHash

snippets/toHash.md

@@ -2,40 +2,23 @@
 title: toHash
 tags: array,intermediate
 firstSeen: 2018-05-31T02:14:04+03:00
-lastUpdated: 2020-10-22T20:24:30+03:00
+lastUpdated: 2022-01-30T12:45:30+03:00
 ---
 
-Reduces a given array-like into a value hash (keyed data store).
+Reduces a given iterable into a value hash (keyed data store).
 
-- Given an iterable object or array-like structure, call `Array.prototype.reduce.call()` on the provided object to step over it and return an `Object`, keyed by the reference value.
+- Use `Object.values()` to get the values of the iterable (object or array).
+- Use `Array.prototype.reduce()` to iterate over the values and create an object, keyed by the reference value.
 
 ```js
 const toHash = (object, key) =>
-  Array.prototype.reduce.call(
+  Object.values(object).reduce((acc, data, index) => {
-    object,
+    acc[!key ? index : data[key]] = data;
-    (acc, data, index) => ((acc[!key ? index : data[key]] = data), acc),
+    return acc;
-    {}
+  }, {});
-  );
 ```
 
 ```js
 toHash([4, 3, 2, 1]); // { 0: 4, 1: 3, 2: 2, 3: 1 }
 toHash([{ a: 'label' }], 'a'); // { label: { a: 'label' } }
-// A more in depth example:
-let users = [
-  { id: 1, first: 'Jon' },
-  { id: 2, first: 'Joe' },
-  { id: 3, first: 'Moe' },
-];
-let managers = [{ manager: 1, employees: [2, 3] }];
-// We use function here because we want a bindable reference, 
-// but a closure referencing the hash would work, too.
-managers.forEach(
-  manager =>
-    (manager.employees = manager.employees.map(function(id) {
-      return this[id];
-    }, toHash(users, 'id')))
-);
-managers; 
-// [ {manager:1, employees: [ {id: 2, first: 'Joe'}, {id: 3, first: 'Moe'} ] } ]
 ```