tests/stress/values-unscopables.js

   1 function test(actual, expected) {
   2     if (actual !== expected)
   3         throw new Error('bad value: ' + actual);
   4 }
   5
   6 (function () {
   7     var array = [];
   8     var values = 42;
   9
  10     with (array) {
  11         test(values, 42);
  12     }
  13
  14     array[Symbol.unscopables].values = false;
  15
  16     with (array) {
  17         test(values, Array.prototype.values);
  18     }
  19 }());
  20
  21 (function () {
  22     var map  = new Map();
  23     var values = 42;
  24
  25     with (map) {
  26         test(values, Map.prototype.values);
  27     }
  28
  29     map[Symbol.unscopables] = {
  30         values: true
  31     };
  32
  33     with (map) {
  34         test(values, 42);
  35     }
  36 }());
  37
  38 (function () {
  39     var set  = new Set();
  40     var values = 42;
  41
  42     with (set) {
  43         test(values, Set.prototype.values);
  44     }
  45
  46     set[Symbol.unscopables] = {
  47         values: true
  48     };
  49
  50     with (set) {
  51         test(values, 42);
  52     }
  53 }());