Count the occurrences of a value in an array

This function counts the number of times a specified value occurs in an array by filtering the array for the specified value and returning the length of the filtered array.

JavaScript:

let countOccurrences = (arr, val) => arr.filter(item => item === val).length;

// Example
console.log(countOccurrences([1, 2, 3, 1, 2, 3, 1], 1)); // 3
console.log(countOccurrences(['a', 'b', 'a', 'c', 'a'], 'a')); // 3

TypeScript:

let countOccurrences = (arr: Array<any>, val: any): number => arr.filter(item => item === val).length;

// Example
console.log(countOccurrences([1, 2, 3, 1, 2, 3, 1], 1)); // 3
console.log(countOccurrences(['a', 'b', 'a', 'c', 'a'], 'a')); // 3