JavaScript/Reserved words/in

The in keyword

The in keyword is used for a shorter notation of the for loop.

Examples

The code

  var numbers = [2, 3, 5, 7, 10, 11], result = 1;

  for (number in numbers) {
    result += number;
    console.log("result = " + result);

    if (result%2 == 0) {
      continue;
    }

    if (result > 20) {
      break;
    }
  }

returns the following:

result = 3
result = 6
result = 11
result = 18
result = 28
result = 39

See also

• break
• continue
• continue