Update object-from-key-value-pairs.md

snippets/object-from-key-value-pairs.md

@@ -1,8 +1,7 @@
 ### Object from key-value pairs
 
-Use `map()` to create objects for each key-value pair, combine with `Object.assign()`.
+Use `Array.reduce()` to create and combine key-value pairs.
 
 ```js
-var objectFromPairs = arr =>
+const objectFromPairs = arr => arr => arr.reduce((a,b) => { a[b[0]] = b[1]; return a;}, {})
-  Object.assign(...arr.map( v => ({ [v[0]] : v[1] })));
 ```