Javascript Nested Loop Break

How to break out of nested loops in javascript

In order to break out of a loop early in Javascript, we can use the break keyword which will terminate the current loop...

for (var i = 0; i < firstArray.length; i++) {
  if (firstArray[i] == myVal) {
    // Do something
    break;
  }
}

Occasionally I need nested loops, with the requirement to break out of both loops on a particular situation.

This can be achieved by using labels...

outerlabel:
for (var i = 0; i < firstArray.length; i++) {
  for (var j = 0; j < secondArray.length; j++) {
    if (firstArray[i] == secondArray[j]) {
      // Do something
      break outerlabel;
    }
  }
}

(Thanks to this answer on stackoverflow)