mdebray/tvl-depot
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add primop genList

Browse source 
This can be used to implement functions like ‘imap’ (or for that
matter, ‘map’) without the quadratic complexity incurred by calling
‘++’ repeatedly.
This commit is contained in:
Eelco Dolstra 2015-07-28 17:27:32 +02:00
parent f3dda728a4
commit 50807f3dd5
3 changed files with 41 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

18
doc/manual/expressions/builtins.xml
View file

@ -364,6 +364,24 @@ builtins.fromJSON ''{"x": [1, 2, 3], "y": null}''
</varlistentry>
<varlistentry><term><function>builtins.genList</function>
<replaceable>generator</replaceable> <replaceable>length</replaceable></term>
<listitem><para>Generate list of size
<replaceable>length</replaceable>, with each element
<replaceable>i></replaceable> equal to the value returned by
<replaceable>generator</replaceable> <literal>i</literal>. For
example,
<programlisting>
builtins.genList (x: x * x) 5
</programlisting>
returns the list <literal>[ 0 1 4 9 16 ]</literal>.</para></listitem>
</varlistentry>
<varlistentry><term><function>builtins.getAttr</function>
<replaceable>s</replaceable> <replaceable>set</replaceable></term>