third_party/WebKit/LayoutTests/fast/js/function-name-is-in-scope.html

   1 <p>This tests verifies the scope of a function's name.
   2 </p>
   3 <pre id="console"></pre>
   4
   5 <script>
   6 function log(s)
   7 {
   8         document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
   9 }
  10
  11 function shouldBe(a, aDescription, b)
  12 {
  13         if (a == b) {
  14                 log("PASS: " + aDescription + " should be " + b + " and is.");
  15                 return;
  16         }
  17         log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".");
  18 }
  19
  20 if (window.testRunner) {
  21         testRunner.dumpAsText();
  22 }
  23
  24 // Function declarations do not put the function's name in scope.
  25 function f()
  26 {
  27         shouldBe(
  28                 f.name == 'f',
  29                 "f.name == 'f'",
  30                 true
  31         );
  32
  33         f = 1;
  34         shouldBe(
  35                 f == 1,
  36                 "f == 1",
  37                 true
  38         );
  39 };
  40
  41 f();
  42
  43 // Function expressions do put the function's name in scope, as a read-only property.
  44 var g = function g()
  45 {
  46         shouldBe(
  47                 g.name == 'g',
  48                 "g.name == 'g'",
  49                 true
  50         );
  51
  52         g = 1;
  53         shouldBe(
  54                 g == arguments.callee,
  55                 "g == arguments.callee",
  56                 true
  57         );
  58 };
  59
  60 g();
  61
  62 </script>