tests/stress/array-fill-put-by-val.js

   1 function shouldThrow(func, message) {
   2     var error = null;
   3     try {
   4         func();
   5     } catch (e) {
   6         error = e;
   7     }
   8     if (!error)
   9         throw new Error("not thrown.");
  10     if (String(error) !== message)
  11         throw new Error("bad error: " + String(error));
  12 }
  13
  14 var array = new Array(10);
  15
  16 for (var i = 0; i < 10; ++i) {
  17     (function (index) {
  18         var seenOnce = false;
  19         var storage = null;
  20         Object.defineProperty(Array.prototype, index, {
  21             get() {
  22                 throw new Error('get is called.' + index);
  23                 return storage;
  24             },
  25             set(value) {
  26                 if (seenOnce)
  27                     throw new Error('set is called.' + index);
  28                 seenOnce = true;
  29                 storage = value;
  30                 return storage;
  31             }
  32         });
  33     }(i));
  34 }
  35
  36 // No error, but all seenOnce becomes true.
  37 array.fill(42);
  38
  39 // Ensures that all setter is called once.
  40 for (var i = 0; i < 10; ++i) {
  41     shouldThrow(function () {
  42         array[i] = i;
  43     }, "Error: set is called." + i);
  44 }