v8/test/mjsunit/compiler/loops.js

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// Test compilation of loops.

var n = 1;
for (var i = 1; (6 - i); i++) {
  // Factorial!
  n = n * i;
}
assertEquals(120, n);

// Test assignments in the loop condition.
function f(i, n) {
  while((n = n - 1) >= 0) {
    i = n + 1;
  }
  return i;
}
assertEquals(1, f(0, 42));


// Test do-while loop and continue.
function g(a) {
  var x = 0, c = 0;
  do {
    x = x + 1;
    if (x < 5) continue;
    c = c + 1;
  } while(x < a);
  return c;
}

assertEquals(6, g(10));

// Test deoptimization in the loop condition.
assertEquals(0, g("foo"));