JSTests/microbenchmarks/in-four-cases.js

   1 function foo(a) {
   2     var result = 0;
   3     for (var i = 0; i < a.length; ++i) {
   4         result <<= 1;
   5         result ^= "foo" in a[i];
   6     }
   7     return result;
   8 }
   9
  10 function bar() {
  11     var array = [{foo:42}, {bar:42}, {fuzz:41, foo:43}, {baz: 47}];
  12     var result = 0;
  13     for (var i = 0; i < 1000000; ++i)
  14         result += foo(array);
  15     return result;
  16 }
  17
  18 var result = bar();
  19 if (result != 10000000)
  20     throw "Bad result: " + result;
  21