// https://javascript.info/closure
// Filter through function
/* .. your code for inBetween and inArray */
let arr = [1, 2, 3, 4, 5, 6, 7];

console.log( arr.filter(inBetween(3, 6)) ); // 3,4,5,6

console.log( arr.filter(inArray([1, 2, 10])) ); // 1,2