Travis build: 1405

README.md

@@ -2246,10 +2246,10 @@ without([2, 1, 2, 3], 1, 2); // [3]
 
 Creates a new array out of the two supplied by creating each possible pair from the arrays.
 
-Use `Array.map()` to produce every possible pair from the elements of the two arrays.
+Use `Array.reduce()`, `Array.map()` and `Array.concat()` to produce every possible pair from the elements of the two arrays and save them in an array.
 
 ```js
-const xProd = (a, b) => a.map(x => b.map(y => [x, y]));
+const xProd = (a, b) => a.reduce((acc, x) => acc.concat(b.map(y => [x, y])), []);
 ```
 
 <details>