arithmetic puzzle

gistfile1.txt

const state = [[6,1,"6"],[6,2,"6"],[5,4,"5"],[2,8,"2"]];

function go(x, y, f, g) {
  if ((x[1] & y[1]) == 0) {
    state.push([f(x[0], y[0]), x[1] | y[1], g(x[2], y[2])]);
  }
}

for (var pass = 0; pass < 3; pass++) {
  const L = state.length;
  for (var i = 0; i < L; i++) {
    for (var j = 0; j < L; j++) {
      go(state[i], state[j], (x, y) => x - y, (x, y) => `(${x}-${y})`);
      go(state[i], state[j], (x, y) => x / y, (x, y) => `(${x}/${y})`);
    }
  }
  for (var i = 0; i < L; i++) {
    for (var j = i+1; j < L; j++) {
      go(state[i], state[j], (x, y) => x * y, (x, y) => `(${x}*${y})`);
      go(state[i], state[j], (x, y) => x + y, (x, y) => `(${x}+${y})`);

    }
  }
}

state.forEach(x => { if (x[0] == 17 && x[1] == 15) console.log(x[2])});