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| author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2015-07-28T15·27+0200 |
|---|---|---|
| committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2015-07-28T15·28+0200 |
| commit | 50807f3dd5241667dac0c0cc302042d648de4b42 (patch) | |
| tree | 3f6222262e66b64c2dc7479f618e2beb78faca9a /doc | |
| parent | f3dda728a4a92520ec9db7bd28a184af9c07db0d (diff) | |
Add primop genList
This can be used to implement functions like ‘imap’ (or for that matter, ‘map’) without the quadratic complexity incurred by calling ‘++’ repeatedly.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/manual/expressions/builtins.xml | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/manual/expressions/builtins.xml b/doc/manual/expressions/builtins.xml index 099f90e786e5..4461570565e1 100644 --- a/doc/manual/expressions/builtins.xml +++ b/doc/manual/expressions/builtins.xml @@ -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> |