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Add foldl' primop

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Eelco Dolstra 2015-07-23 17:03:02 +02:00
parent 887bb5fa5a
commit 61af14a921
3 changed files with 38 additions and 1 deletions
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13
doc/manual/expressions/builtins.xml
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@ -313,6 +313,19 @@ stdenv.mkDerivation {
</varlistentry>
<varlistentry><term><function>builtins.foldl’</function>
<replaceable>op</replaceable> <replaceable>nul</replaceable> <replaceable>list</replaceable></term>
<listitem><para>Reduce a list by applying a binary operator, from
left to right, e.g. <literal>foldl’ op nul [x0 x1 x2 ...] = op (op
(op nul x0) x1) x2) ...</literal>. The operator is applied
strictly, i.e., its arguments are evaluated first. For example,
<literal>foldl’ (x: y: x + y) 0 [1 2 3]</literal> evaluates to
6.</para></listitem>
</varlistentry>
<varlistentry><term><function>builtins.fromJSON</function> <replaceable>e</replaceable></term>
<listitem><para>Convert a JSON string to a Nix