5.21 break

The break keyword leaves the control flow of the innermost loop (for or while) it is declared in, stopping further iterations:

while (true) {
  if (condition) break;

Here, expression1 is evaluated for each iteration, but as soon as condition holds, the current iteration is terminated without evaluating expression2, and no more iteration is done.

The typer ensures that it appears only within a loop. The break keyword in switch cases is not supported in Haxe.