Get all n-th items of an array

JavaScript version

const getNthItems = (arr, nth) => arr.filter((_, i) => i % nth === nth - 1);

TypeScript version

const getNthItems = <T,_>(arr: T[], nth: number): T[] => arr.filter((_, i) => i % nth === nth - 1);

Examples

getNthItems([1, 2, 3, 4, 5, 6, 7, 8, 9], 2); // [2, 4, 6, 8]
getNthItems([1, 2, 3, 4, 5, 6, 7, 8, 9], 3); // [3, 6, 9]