filtro simple js

  <script>
    var arr = [0,1001, 2,6,9]


    Array.prototype.$filter = function (callback) {
      let arr = this
      let ans = new Array()
      for (let i = 0; i < arr.length; i++) {
        if(callback(arr[i])) {
          ans.push(arr[i])
        }
      }
      return ans
    }

    var result = arr.$filter((item) => {
      return item >= 1
    })

    console.log(result);
  </script>