File r37/lisp/csl/html/r37_0048.html artifact fd2e55f7de part of check-in 3af273af29

<A NAME=FOREACH>

<TITLE>FOREACH</TITLE></A>
<b><a href=r37_idx.html>INDEX</a></b><p><p>



<B>FOREACH</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>command</B><P>
<P>
 
 <P>
<P>
<em>foreach</em>is a synonym for the <em>for each</em> variant of the 

<A HREF=r37_0047.html>for</A> construct. It is designed to iterate down a list, 
and an 
error will occur if a list is not used. The use of <em>for each</em> is 
preferred to <em>foreach</em>. 
<P>
<P>
 <P> <H3> 
syntax: </H3>
<em>foreach</em>&lt;variable&gt; in &lt;list&gt; &lt;action&gt; &lt;expression
&gt; 
<P>
<P>
where &lt;action&gt; ::= <em>do | product | sum | collect | join</em> 
<P>
<P>
<P>
 <P> <H3> 
examples: </H3>
<P><PRE><TT>
foreach x in {q,r,s} sum x**2; 

   2    2    2
  Q  + R  + S

</TT></PRE><P>