Add mapConsecutive

snippets/mapConsecutive.md

@@ -0,0 +1,20 @@
+---
+title: mapConsecutive
+tags: array,intermediate
+firstSeen: 2021-08-08T05:00:00-04:00
+---
+
+Maps each block of `n` consencutive elements using the given function, `fn`.
+
+- Use `Array.prototype.slice()` to get `arr` with `n` elements removed from the left.
+- Use `Array.prototype.map()` and `Array.prototype.slice()` to apply `fn` to each block of `n` consecutive elements in `arr`.
+
+```js
+const mapConsecutive = (arr, n, fn) =>
+  arr.slice(n - 1).map((v, i) => fn(arr.slice(i, i + n)));
+```
+
+```js
+mapConsecutive([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 3, x => x.join('-'));
+// ['1-2-3', '2-3-4', '3-4-5', '4-5-6', '5-6-7', '6-7-8', '7-8-9', '8-9-10'];
+```