tests/stress/array-from-with-iterable.js

   1 function shouldBe(actual, expected) {
   2     if (actual !== expected)
   3         throw new Error('bad value: ' + actual);
   4 }
   5
   6 // Set is iterable.
   7 var set = new Set([0, 1, 2, 3, 4, 5]);
   8 var array = Array.from(set);
   9
  10 shouldBe(array.length, set.size);
  11 for (var i = 0; i < array.length; ++i) {
  12     shouldBe(set.has(array[i]), true);
  13 }
  14
  15 // Map is iterable.
  16 var map = new Map([
  17     [0, 0],
  18     [1, 0],
  19     [2, 0],
  20     [3, 0],
  21     [4, 0],
  22     [5, 0]
  23 ]);
  24 var array = Array.from(map);
  25
  26 shouldBe(array.length, map.size);
  27 for (var i = 0; i < array.length; ++i) {
  28     shouldBe(array[i][1], 0);
  29     shouldBe(map.has(array[i][0]), true);
  30     shouldBe(map.get(array[i][0]), 0);
  31 }
  32
  33 // String is iterable
  34 var string = "Cocoa Cappuccino";
  35 var array = Array.from(string);
  36 shouldBe(array.length, string.length);
  37 for (var i = 0; i < array.length; ++i) {
  38     shouldBe(array[i], string[i]);
  39 }
  40
  41 // Arguments is iterable
  42 var argumentsGenerators = [
  43     function () {
  44         return arguments;
  45     },
  46
  47     function () {
  48         'use strict';
  49         return arguments;
  50     },
  51
  52     function (a, b, c) {
  53         return arguments;
  54     },
  55
  56     function (a, b, c) {
  57         'use strict';
  58         return arguments;
  59     }
  60 ];
  61
  62 for (var gen of argumentsGenerators) {
  63     var args = gen(1, 2, 3, 4, 5);
  64     var array = Array.from(args);
  65     shouldBe(array.length, args.length);
  66     for (var i = 0; i < array.length; ++i) {
  67         shouldBe(array[i], args[i]);
  68     }
  69 }