wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-07-07 10:11:47 +02:00
Code Activity

* New built-in function `builtins.attrNames' that returns the

Browse source 
names of the attributes in an attribute set.
This commit is contained in:
Eelco Dolstra 2006-12-12 16:14:31 +00:00
parent 5e6699188f
commit 1a7e88bbd9
4 changed files with 51 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

18
doc/manual/writing-nix-expressions.xml
View file

@ -1362,6 +1362,24 @@ is also available as <function>builtins.derivation</function>.</para>
</varlistentry>
<varlistentry><term><function>builtins.attrNames</function>
<replaceable>attrs</replaceable></term>
<listitem><para>Return the names of the attributes in the
attribute set <replaceable>attrs</replaceable> in a sorted list.
For instance, <literal>builtins.attrNames {y = 1; x =
"foo";}</literal> evaluates to <literal>["x" "y"]</literal>.
There is no built-in function <function>attrValues</function>, but
you can easily define it yourself:
<programlisting>
attrValues = attrs: map (name: builtins.getAttr name attrs) (builtins.attrNames attrs);</programlisting>
</para></listitem>
</varlistentry>
<varlistentry><term><function>baseNameOf</function> <replaceable>s</replaceable></term>
<listitem><para>Return the <emphasis>base name</emphasis> of the