Add unzip

snippets/unzip.md

@@ -0,0 +1,21 @@
+### unzip
+
+Creates an array of arrays, ungrouping the elements in an array produced by [zip](#zip).
+
+Use `Math.max.apply()` to get the longest subarray in the array, `Array.map()` to make each element an array.
+Use `Array.reduce()` and `Array.forEach()` to map grouped values to individual arrays.
+
+```js
+const unzip = arr =>
+  arr.reduce(
+    (acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc),
+    Array.from({
+      length: Math.max(...arr.map(x => x.length)),
+    }).map(x => [])
+  );
+```
+
+```js
+unzip([['a', 1, true], ['b', 2, false]]); //[['a', 'b'], [1, 2], [true, false]]
+unzip([['a', 1, true], ['b', 2]]); //[['a', 'b'], [1, 2], [true]]
+```