7 | title: Object iteration 8 | stage: 2 9 | contributors: Jonathan Keslin 10 |11 | 12 |
When the *iterateKeys* function is called with argument _O_, the following steps are taken:
15 |When the *iterateValues* function is called with argument _O_, the following steps are taken:
25 |When the *iterateEntries* function is called with argument _O_, the following steps are taken:
35 |7 | title: Object iteration (alternate spec text) 8 | stage: 2 9 | contributors: Jonathan Keslin 10 |11 | 12 |
When the *iterateKeys* function is called with argument _O_, the following steps are taken:
15 |When the *iterateValues* function is called with argument _O_, the following steps are taken:
24 |When the *iterateEntries* function is called with argument _O_, the following steps are taken:
33 |An Object Iterator is an object, that represents a specific iteration over some specific instance object. There is not a named constructor for Object Iterator objects. Instead, Object Iterator objects are created by calling certain methods of the Object global.
42 | 43 |Several methods of the Object global return Iterator objects. The abstract operation CreateObjectIterator with arguments _obj_ and _kind_ is used to create such iterator objects. It performs the following steps:
46 |The %ObjectIteratorPrototype% object:
58 |The initial value of the @@toStringTag property is the String value *"Object Iterator"*.
91 |This property has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *true* }.
92 |Object Iterator instances are ordinary objects that inherit properties from the %ObjectIteratorPrototype% intrinsic object. Object Iterator instances are initially created with the internal slots described in
| 103 | Internal Slot 104 | | 105 |106 | Description 107 | | 108 |
|---|---|
| 111 | [[IteratedObject]] 112 | | 113 |114 | The object that is being iterated. 115 | | 116 |
| 119 | [[ObjectNextIndex]] 120 | | 121 |122 | The integer index of the next enumerable element to be examined by this iterator. 123 | | 124 |
| 127 | [[ObjectIterationKind]] 128 | | 129 |130 | A String value that identifies what is returned for each element of the iteration. The possible values are: ~key~, ~value~, ~key+value~. 131 | | 132 |
When the
When the
When the
© 2020 Jonathan Keslin
1834 | 1835 |All Software contained in this document ("Software") is protected by copyright and is being made available under the "BSD License", included below. This Software may be subject to third party rights (rights from parties other than Ecma International), including patent rights, and no licenses under such third party rights are granted under this license even if the third party concerned is a member of Ecma International. SEE THE ECMA CODE OF CONDUCT IN PATENT MATTERS AVAILABLE AT https://ecma-international.org/memento/codeofconduct.htm FOR INFORMATION REGARDING THE LICENSING OF PATENT CLAIMS THAT ARE REQUIRED TO IMPLEMENT ECMA INTERNATIONAL STANDARDS.
1837 | 1838 |Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1839 | 1840 |THIS SOFTWARE IS PROVIDED BY THE ECMA INTERNATIONAL "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ECMA INTERNATIONAL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1847 | 1848 |When the
When the
When the
An Object Iterator is an object, that represents a specific iteration over some specific instance object. There is not a named constructor for Object Iterator objects. Instead, Object Iterator objects are created by calling certain methods of the Object global.
1834 | 1835 |Several methods of the Object global return Iterator objects. The abstract operation CreateObjectIterator with arguments obj and kind is used to create such iterator objects. It performs the following steps:
1838 |The %ObjectIteratorPrototype% object:
1845 |The initial value of the @@toStringTag property is the String value
This property has the attributes { [[Writable]]:
Object Iterator instances are ordinary objects that inherit properties from the
| 1873 | Internal Slot 1874 | 1875 | | 1876 |1877 | Description 1878 | 1879 | | 1880 |
|---|---|
| 1883 | [[IteratedObject]] 1884 | 1885 | | 1886 |1887 | The object that is being iterated. 1888 | 1889 | | 1890 |
| 1893 | [[ObjectNextIndex]] 1894 | 1895 | | 1896 |1897 | The integer index of the next enumerable element to be examined by this iterator. 1898 | 1899 | | 1900 |
| 1903 | [[ObjectIterationKind]] 1904 | 1905 | | 1906 |
1907 | A String value that identifies what is returned for each element of the iteration. The possible values are: |
1910 |
© 2020 Jonathan Keslin
1920 | 1921 |All Software contained in this document ("Software") is protected by copyright and is being made available under the "BSD License", included below. This Software may be subject to third party rights (rights from parties other than Ecma International), including patent rights, and no licenses under such third party rights are granted under this license even if the third party concerned is a member of Ecma International. SEE THE ECMA CODE OF CONDUCT IN PATENT MATTERS AVAILABLE AT https://ecma-international.org/memento/codeofconduct.htm FOR INFORMATION REGARDING THE LICENSING OF PATENT CLAIMS THAT ARE REQUIRED TO IMPLEMENT ECMA INTERNATIONAL STANDARDS.
1923 | 1924 |Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1925 | 1926 |THIS SOFTWARE IS PROVIDED BY THE ECMA INTERNATIONAL "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ECMA INTERNATIONAL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1933 | 1934 |