function bitTest(num, bit){

  return ((num>>bit) % 2 != 0)

}

​

function bitSet(num, bit){

  return num | 1<<bit;

}

​

function isDisarmed(input, rules) {

  var result = { disarm: true };

  for (var i=0; i<input.length; i++) {

    var wire = input[i];

    var rule = rules[wire];

    var isPos = rule.p > 0;

    var ruleVal = rule.p || rule.n;

    if (ruleVal) {

      if (i + 1 < input.length) {

        var nextWire = input[i + 1];

        var wireCut = bitTest(ruleVal, nextWire);

        if ((isPos && !wireCut) || (!isPos && wireCut)) {

          result = { disarm: false, wire: names[wire], next: names[nextWire] };

          break;

        }

      }

      else if (isPos) {

        result = { disarm: false, wire: wire };

        break;

      }

    }

  }

  return result;

}

​

//

// Bit array order: white, black, purple, red, green, orange.

//                    5      4      3      2     1      0

var names = ['orange', 'green', 'red', 'purple', 'black', 'white'];

var rules = [

  { p: 20, n: 0 },

  { p: 33, n: 0 },

  { p: 2, n: 0 },

  { p: 0, n: 43 },

  { p: 0, n: 35 },

  { p: 0, n: 48 }

]

​

var input1 = [5, 2, 1, 5];

var input2 = [5, 0, 1, 5];

​

function driver(input) {

  var result = isDisarmed(input, rules);

  if (result.disarm) {

    console.log('Bomb defused');

  }

  else {

    console.log('Boom');

    console.log(result);

  }  

}

​

driver(input1);

driver(input2);