fix naming

snippets/count-occurrences.md

@@ -0,0 +1,8 @@
+### Count occurrences of a value in array
+
+Use `Array.reduce()` to increment a counter each time you encounter the specific value inside the array.
+
+```js
+const countOccurrences = (arr, value) => arr.reduce((a, v) => v === value ? a + 1 : a + 0, 0);
+// countOccurrences([1,1,2,1,2,3], 1) -> 3
+```