Stage 4 Draft / March 29, 2016

Object.values / Object.entries

1Object.keys( O )#

When the keys function is called with argument O, the following steps are taken:

  1. Let obj be ? ToObject(O).
  2. Let nameList be ? EnumerableOwnProperties(obj, "key").
  3. Return CreateArrayFromList(nameList).

2Object.values( O )#

When the values function is called with argument O, the following steps are taken:

  1. Let obj be ? ToObject(O).
  2. Let valueList be ? EnumerableOwnProperties(obj, "value").
  3. Return CreateArrayFromList(valueList).

3Object.entries( O )#

When the entries function is called with argument O, the following steps are taken:

  1. Let obj be ? ToObject(O).
  2. Let entryList be ? EnumerableOwnProperties(obj, "key+value").
  3. Return CreateArrayFromList(entryList).

4EnumerableOwnProperties#

When the abstract operation EnumerableOwnProperties is called with Object O and String kind the following steps are taken:

  1. Assert: Type(O) is Object.
  2. Let ownKeys be ? O.[[OwnPropertyKeys]]().
  3. Let properties be a new empty List.
  4. Repeat, for each element key of ownKeys in List order
    1. If Type(key) is String, then
      1. Let desc be ? O.[[GetOwnProperty]](key).
      2. If desc is not undefined and desc.[[Enumerable]] is true, then
        1. If kind is "key", append key to properties.
        2. Else,
          1. Let value be ? Get(O, key).
          2. If kind is "value", append value to properties.
          3. Else,
            1. Assert: kind is "key+value".
            2. Let entry be CreateArrayFromList(« key, value »).
            3. Append entry to properties.
  5. Order the elements of properties so they are in the same relative order as would be produced by the Iterator that would be returned if the EnumerateObjectProperties internal method was invoked with O.
  6. Return properties.

Note: The " EnumerableOwnNames" section is deleted. Any existing references to EnumerableOwnNames(x) should be changed to EnumerableOwnProperties(x, "key")

ACopyright & Software License#

Copyright Notice

© 2016 Jordan Harband

Software License

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 http://www.ecma-international.org/memento/codeofconduct.htm FOR INFORMATION REGARDING THE LICENSING OF PATENT CLAIMS THAT ARE REQUIRED TO IMPLEMENT ECMA INTERNATIONAL STANDARDS.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  3. Neither the name of the authors nor Ecma International may be used to endorse or promote products derived from this software without specific prior written permission.

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.