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> <SPAN CLASS="cmr"
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>[</SPAN
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><SPAN CLASS="cmssi"
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>result-form</SPAN
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>}</SPAN
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> <SPAN CLASS="cmsy"
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>|</SPAN
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> <SPAN CLASS="cmssi"
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><SPAN CLASS="cmsy"
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>}</SPAN
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>*</SPAN
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>→</SPAN
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></SPAN
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> <SPAN CLASS="cmsy"
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>{</SPAN
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><VAR CLASS="param"
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>result</VAR
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><SPAN CLASS="cmsy"
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>}</SPAN
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><SPAN CLASS="cmr"
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>*</SPAN
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></DIV
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></DD
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><B
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>Arguments and Values</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>var</VAR
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> — a <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>list-form</VAR
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> — a <A HREF="26_1_Glossary.html#form"
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><EM CLASS="term"
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>form</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>result-form</VAR
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> — a <A HREF="26_1_Glossary.html#form"
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><EM CLASS="term"
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>form</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>declaration</VAR
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> — a <A HREF="m_declare.html" CLASS="misc"
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><B
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>declare</B
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></A
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> <A HREF="26_1_Glossary.html#expression"
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><EM CLASS="term"
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>expression</EM
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></A
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>; not evaluated. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>tag</VAR
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> — a <A HREF="26_1_Glossary.html#go_tag"
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><EM CLASS="term"
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>go tag</EM
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></A
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>; not evaluated. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>statement</VAR
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> — a <A HREF="26_1_Glossary.html#compound_form"
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><EM CLASS="term"
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>compound form</EM
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></A
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>; evaluated as described below. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>results</VAR
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> — if a <A HREF="f_return.html" CLASS="macref"
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><B
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>return</B
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></A
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> or <A HREF="f_return-from.html" CLASS="specref"
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><B
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>return-from</B
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></A
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> form is executed, the <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>values</EM
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></A
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> passed from that <A HREF="26_1_Glossary.html#form"
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><EM CLASS="term"
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>form</EM
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></A
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>; otherwise, the <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>values</EM
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></A
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> returned by the <VAR CLASS="param"
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>result-form</VAR
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> or <SPAN CLASS="misc"
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><B
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>nil</B
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></SPAN
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> if there is no <VAR CLASS="param"
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>result-form</VAR
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>.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="f_dolist.html" CLASS="macref"
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><B
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>dolist</B
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></A
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> iterates over the elements of a <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>list</EM
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></A
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>. The body of <A HREF="f_dolist.html" CLASS="macref"
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><B
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>dolist</B
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></A
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> is like a <A HREF="f_tagbody.html" CLASS="specref"
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><B
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>tagbody</B
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></A
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>. It consists of a series of <VAR CLASS="param"
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>tags</VAR
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> and <VAR CLASS="param"
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>statements</VAR
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>. </P
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><P CLASS="j"
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><A HREF="f_dolist.html" CLASS="macref"
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><B
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>dolist</B
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></A
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> evaluates <VAR CLASS="param"
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>list-form</VAR
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>, which should produce a <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>list</EM
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></A
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>. It then executes the body once for each element in the <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>list</EM
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></A
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>, in the order in which the <VAR CLASS="param"
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>tags</VAR
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> and <VAR CLASS="param"
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>statements</VAR
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> occur, with <VAR CLASS="param"
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>var</VAR
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> bound to the element. Then <VAR CLASS="param"
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>result-form</VAR
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> is evaluated. <VAR CLASS="param"
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>tags</VAR
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> label <VAR CLASS="param"
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>statements</VAR
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>. </P
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><P CLASS="j"
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>At the time <VAR CLASS="param"
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>result-form</VAR
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> is processed, <VAR CLASS="param"
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>var</VAR
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> is bound to <SPAN CLASS="misc"
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><B
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>nil</B
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></SPAN
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>. </P
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><P CLASS="j"
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>An <A HREF="26_1_Glossary.html#implicit_block"
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><EM CLASS="term"
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>implicit block</EM
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></A
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> named <SPAN CLASS="misc"
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><B
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>nil</B
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></SPAN
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> surrounds <A HREF="f_dolist.html" CLASS="macref"
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><B
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>dolist</B
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></A
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>. <A HREF="f_return.html" CLASS="macref"
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><B
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>return</B
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></A
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> may be used to terminate the loop immediately without performing any further iterations, returning zero or more <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>values</EM
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></A
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>. </P
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#scope"
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><EM CLASS="term"
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>scope</EM
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></A
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> of the binding of <VAR CLASS="param"
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>var</VAR
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> does not include the <VAR CLASS="param"
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>list-form</VAR
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>, but the <VAR CLASS="param"
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>result-form</VAR
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> is included. </P
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><P CLASS="j"
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>It is <A HREF="26_1_Glossary.html#implementation-dependent"
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><EM CLASS="term"
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>implementation-dependent</EM
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></A
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> whether <A HREF="f_dolist.html" CLASS="macref"
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><B
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>dolist</B
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></A
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> <A HREF="26_1_Glossary.html#establish"
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><EM CLASS="term"
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>establishes</EM
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></A
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> a new <A HREF="26_1_Glossary.html#binding"
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><EM CLASS="term"
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>binding</EM
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></A
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> of <VAR CLASS="param"
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>var</VAR
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> on each iteration or whether it <A HREF="26_1_Glossary.html#establish"
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><EM CLASS="term"
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>establishes</EM
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></A
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> a binding for <VAR CLASS="param"
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>var</VAR
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> once at the beginning and then <VAR CLASS="param"
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>assigns</VAR
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> it on any subsequent iterations.</P
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></DD
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><DT
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><B
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>Examples</B
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||
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></DT
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||
|
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><DD
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||
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><PRE CLASS="screen"
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> (setq temp-two '()) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> NIL
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(dolist (temp-one '(1 2 3 4) temp-two) (push temp-one temp-two)) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (4 3 2 1)
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(setq temp-two 0) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 0
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(dolist (temp-one '(1 2 3 4)) (incf temp-two)) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> NIL
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temp-two <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
|
||
|
|
></SPAN
|
||
|
|
> 4
|
||
|
|
|
||
|
|
(dolist (x '(a b c d)) (prin1 x) (princ " "))
|
||
|
|
<SPAN CLASS="cmr"
|
||
|
|
>⊳</SPAN
|
||
|
|
> A B C D
|
||
|
|
<SPAN CLASS="cmsy"
|
||
|
|
><SPAN CLASS="arrow"
|
||
|
|
>→</SPAN
|
||
|
|
></SPAN
|
||
|
|
> NIL</PRE
|
||
|
|
></DD
|
||
|
|
><DT
|
||
|
|
><B
|
||
|
|
>See Also</B
|
||
|
|
></DT
|
||
|
|
><DD
|
||
|
|
><P CLASS="j"
|
||
|
|
><A HREF="f_do.html" CLASS="macref"
|
||
|
|
><B
|
||
|
|
>do</B
|
||
|
|
></A
|
||
|
|
>, <A HREF="f_dotimes.html" CLASS="macref"
|
||
|
|
><B
|
||
|
|
>dotimes</B
|
||
|
|
></A
|
||
|
|
>, <A HREF="f_tagbody.html" CLASS="specref"
|
||
|
|
><B
|
||
|
|
>tagbody</B
|
||
|
|
></A
|
||
|
|
>, <A HREF="3_6_Traversal_Rules_and_Side_Effects.html#sec_3_6" CLASS="secref"
|
||
|
|
><SPAN CLASS="cmr"
|
||
|
|
>Section</SPAN
|
||
|
|
> <SPAN CLASS="cmr"
|
||
|
|
>3.6</SPAN
|
||
|
|
> <SPAN CLASS="cmr"
|
||
|
|
>(Traversal</SPAN
|
||
|
|
> <SPAN CLASS="cmr"
|
||
|
|
>Rules</SPAN
|
||
|
|
> <SPAN CLASS="cmr"
|
||
|
|
>and</SPAN
|
||
|
|
> <SPAN CLASS="cmr"
|
||
|
|
>Side</SPAN
|
||
|
|
> <SPAN CLASS="cmr"
|
||
|
|
>Effects)</SPAN
|
||
|
|
></A
|
||
|
|
></P
|
||
|
|
></DD
|
||
|
|
><DT
|
||
|
|
><B
|
||
|
|
>Notes</B
|
||
|
|
></DT
|
||
|
|
><DD
|
||
|
|
><P CLASS="j"
|
||
|
|
><A HREF="f_go.html" CLASS="specref"
|
||
|
|
><B
|
||
|
|
>go</B
|
||
|
|
></A
|
||
|
|
> may be used within the body of <A HREF="f_dolist.html" CLASS="macref"
|
||
|
|
><B
|
||
|
|
>dolist</B
|
||
|
|
></A
|
||
|
|
> to transfer control to a statement labeled by a <VAR CLASS="param"
|
||
|
|
>tag</VAR
|
||
|
|
>.</P
|
||
|
|
></DD
|
||
|
|
></DL
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><DIV CLASS="footer"
|
||
|
|
><DIV CLASS="btmnav"
|
||
|
|
><A HREF="f_dotimes.html" CLASS="prev"
|
||
|
|
>←</A
|
||
|
|
><A HREF="f_loop.html" CLASS="next"
|
||
|
|
>→</A
|
||
|
|
></DIV
|
||
|
|
><DIV CLASS="trail"
|
||
|
|
>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><SCRIPT
|
||
|
|
>domReady();</SCRIPT
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></BODY
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></HTML
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>
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