prefixed Array. to reduce(), sort(), map() methods in snippets.

snippets/count-occurrences-of-a-value-in-array.md

@@ -1,6 +1,6 @@
 ### Count occurrences of a value in array
 
-Use `reduce()` to increment a counter each time you encounter the specific value inside the 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);