Codility: Triangle Solution

1function solution(A) {
2  if (A.length < 3) {
3    return 0
4  }
5
6  function isTriangle(a, b, c) {
7    return (a > 0) & (b > 0) & (c > 0) && a + b > c && a + c > b && b + c > a
8  }
9
10  A.sort((a, b) => a - b)
11
12  let count = 0
13  for (let i = 0; i < A.length - 2; i++) {
14    if (!isTriangle(A[i], A[i + 1], A[i + 2])) {
15      count++
16    }
17  }
18
19  return count === A.length - 2 ? 0 : 1
20}