Viewing: fa.javascript.info

arr.filter(f) . f . true .

inBetween(a, b) a b ( ).
inArray([...]) .

arr.filter(inBetween(3,6)) 3 6 .
arr.filter(inArray([1,2,3])) [1,2,3] .

          /* .. inArray  inBetween    */
let arr = [1, 2, 3, 4, 5, 6, 7];

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

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

sandbox .

Filter inBetween

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

let arr = [1, 2, 3, 4, 5, 6, 7];
alert( arr.filter(inBetween(3, 6)) ); // 3,4,5,6

Filter inArray

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

let arr = [1, 2, 3, 4, 5, 6, 7];
alert( arr.filter(inArray([1, 2, 10])) ); // 1,2

          function inArray(arr) {
  return x => arr.includes(x);
}

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

sandbox.