Rename js snippets

snippets/js/s/successive-values-array.md

@@ -0,0 +1,26 @@
+---
+title: Array of successive values
+type: snippet
+language: javascript
+tags: [array]
+cover: laptop-view
+excerpt: Applies a function to each element from left to right, returning an array of successively reduced values.
+dateModified: 2020-10-22T20:24:04+03:00
+---
+
+Applies a function against an accumulator and each element in the array (from left to right), returning an array of successively reduced values.
+
+- Use `Array.prototype.reduce()` to apply the given function to the given array, storing each new result.
+
+```js
+const reduceSuccessive = (arr, fn, acc) =>
+  arr.reduce(
+    (res, val, i, arr) => (res.push(fn(res.slice(-1)[0], val, i, arr)), res),
+    [acc]
+  );
+```
+
+```js
+reduceSuccessive([1, 2, 3, 4, 5, 6], (acc, val) => acc + val, 0);
+// [0, 1, 3, 6, 10, 15, 21]
+```