test/mjsunit/for-in.js

// Copyright 2008 the V8 project authors. All rights reserved.
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function props(x) {
  var array = [];
  for (var p in x) array.push(p);
  return array.sort();
}

assertEquals(0, props({}).length, "olen0");
assertEquals(1, props({x:1}).length, "olen1");
assertEquals(2, props({x:1, y:2}).length, "olen2");

assertArrayEquals(["x"], props({x:1}), "x");
assertArrayEquals(["x", "y"], props({x:1, y:2}), "xy");
assertArrayEquals(["x", "y", "zoom"], props({x:1, y:2, zoom:3}), "xyzoom");

assertEquals(0, props([]).length, "alen0");
assertEquals(1, props([1]).length, "alen1");
assertEquals(2, props([1,2]).length, "alen2");

assertArrayEquals(["0"], props([1]), "0");
assertArrayEquals(["0", "1"], props([1,2]), "01");
assertArrayEquals(["0", "1", "2"], props([1,2,3]), "012");

var o = {};
var a = [];
for (var i = 0x0020; i < 0x01ff; i+=2) {
  var s = 'char:' + String.fromCharCode(i);
  a.push(s);
  o[s] = i;
}
assertArrayEquals(a, props(o), "charcodes");

var a = [];
assertEquals(0, props(a).length, "proplen0");
a[Math.pow(2,30)-1] = 0;
assertEquals(1, props(a).length, "proplen1");
a[Math.pow(2,31)-1] = 0;
assertEquals(2, props(a).length, "proplen2");
a[1] = 0;
assertEquals(3, props(a).length, "proplen3");

for (var hest = 'hest' in {}) { }
assertEquals('hest', hest, "empty-no-override");

var result = '';
for (var p in {a : [0], b : 1}) { result += p; }
assertEquals('ab', result, "ab");

var result = '';
for (var p in {a : {v:1}, b : 1}) { result += p; }
assertEquals('ab', result, "ab-nodeep");

var result = '';
for (var p in { get a() {}, b : 1}) { result += p; }
assertEquals('ab', result, "abget");

var result = '';
for (var p in { get a() {}, set a(x) {}, b : 1}) { result += p; }
assertEquals('ab', result, "abgetset");


// Test that for-in in the global scope works with a keyed property as "each".
// Test outside a loop and in a loop for multiple iterations.
a = [1,2,3,4];
x = {foo:5, bar:6, zip:7, glep:9, 10:11};
delete x.bar;
y = {}

for (a[2] in x) {
  y[a[2]] = x[a[2]];
}

assertEquals(5, y.foo, "y.foo");
assertEquals("undefined", typeof y.bar, "y.bar");
assertEquals(7, y.zip, "y.zip");
assertEquals(9, y.glep, "y.glep");
assertEquals(11, y[10], "y[10]");
assertEquals("undefined", typeof y[2], "y[2]");
assertEquals("undefined", typeof y[0], "y[0]");

for (i=0 ; i < 3; ++i) {
  y = {}

  for (a[2] in x) {
    y[a[2]] = x[a[2]];
  }

  assertEquals(5, y.foo, "y.foo");
  assertEquals("undefined", typeof y.bar, "y.bar");
  assertEquals(7, y.zip, "y.zip");
  assertEquals(9, y.glep, "y.glep");
  assertEquals(11, y[10], "y[10]");
  assertEquals("undefined", typeof y[2], "y[2]");
  assertEquals("undefined", typeof y[0], "y[0]");
}