Javascript filter method using the closure feature

closure.js

let arr = [1, 2, 3, 4, 5, 6, 7];

function inBetween(a,b){
  return function(num){
     return (num >=a && num <= b)
  }
}

function inArray(arr){
  return function(x){
    return arr.includes(x)
  }
}

const newArr = arr.filter(inBetween(3,6))

const matchArr = arr.filter(inArray([1,2,10]))