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<HTML LANG="en-us"
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>count, count-if, count-if-not | Common Lisp Nova Spec</TITLE
><META CHARSET="US-ASCII"
><LINK REL="canonical" HREF="f_count.html"
><LINK REL="next" HREF="f_length.html" TYPE="text/html" TITLE="length"
><LINK REL="prev" HREF="f_reduce.html" TYPE="text/html" TITLE="reduce"
><LINK REL="up" HREF="17_3_Sequences_Dictionary.html" TYPE="text/html" TITLE="17.3 Sequences Dictionary"
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><DIV
><DIV CLASS="topnav"
><DIV CLASS="breadcrumb"
><SPAN CLASS="breadcrumb-item"
><A HREF="index.html"
>Common Lisp Nova Spec</A
></SPAN
> <SPAN CLASS="breadcrumb-item"
>&#8594; <A HREF="17_Sequences.html"
>17. Sequences</A
></SPAN
> <SPAN CLASS="breadcrumb-item"
>&#8594; <A HREF="17_3_Sequences_Dictionary.html"
>17.3 Sequences Dictionary</A
></SPAN
> <SPAN CLASS="breadcrumb-item"
>&#8594; <A HREF="f_count.html"
>count, count-if, count-if-not</A
></SPAN
></DIV
><DIV CLASS="apropos"
><DIV CLASS="apropos-io"
><A HREF="f_reduce.html" CLASS="prev"
>&#8592;</A
><SPAN ID="apropos-label"
>Apropos </SPAN
><INPUT ID="apropos" AUTOFOCUS="AUTOFOCUS" PLACEHOLDER="Type here to search" ONINPUT="aproposInput(this);" ONKEYUP="aproposKeyup(event);" ONCHANGE="aproposChange(this);" ONFOCUS="aproposFocus(this);" ONFOCUSOUT="aproposFocusout(this);"
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><DIV ID="apropos-res"
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></DIV
><DIV CLASS="matter"
><DIV CLASS="com"
><DIV CLASS="begincom"
><HR
><TABLE WIDTH="100%" CELLSPACING="0" CELLPADDING="0"
><TR
><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="count, count-if, count-if-not"
></SPAN
><B
>count, count-if, count-if-not</B
></TD
><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
><I
>Function</I
></TD
></TR
></TABLE
><HR
></DIV
><UL CLASS="subtoc"
></UL
><DL
><DT
><B
>Syntax</B
></DT
><DD
><P CLASS="j"
><B
>count</B
> <SPAN CLASS="cmssi"
>item</SPAN
> <SPAN CLASS="cmssi"
>sequence</SPAN
> <SPAN CLASS="cmtt"
>&amp;key</SPAN
> <SPAN CLASS="cmssi"
>from-end</SPAN
> <SPAN CLASS="cmssi"
>start</SPAN
> <SPAN CLASS="cmssi"
>end</SPAN
> <SPAN CLASS="cmssi"
>key</SPAN
> <SPAN CLASS="cmssi"
>test</SPAN
> <SPAN CLASS="cmssi"
>test-not</SPAN
> <SPAN CLASS="arrow"
>&#8594;</SPAN
> <SPAN CLASS="cmssi"
>n</SPAN
></P
><P CLASS="j"
><B
>count-if</B
> <SPAN CLASS="cmssi"
>predicate</SPAN
> <SPAN CLASS="cmssi"
>sequence</SPAN
> <SPAN CLASS="cmtt"
>&amp;key</SPAN
> <SPAN CLASS="cmssi"
>from-end</SPAN
> <SPAN CLASS="cmssi"
>start</SPAN
> <SPAN CLASS="cmssi"
>end</SPAN
> <SPAN CLASS="cmssi"
>key</SPAN
> <SPAN CLASS="arrow"
>&#8594;</SPAN
> <SPAN CLASS="cmssi"
>n</SPAN
></P
><P CLASS="j"
><B
>count-if-not</B
> <SPAN CLASS="cmssi"
>predicate</SPAN
> <SPAN CLASS="cmssi"
>sequence</SPAN
> <SPAN CLASS="cmtt"
>&amp;key</SPAN
> <SPAN CLASS="cmssi"
>from-end</SPAN
> <SPAN CLASS="cmssi"
>start</SPAN
> <SPAN CLASS="cmssi"
>end</SPAN
> <SPAN CLASS="cmssi"
>key</SPAN
> <SPAN CLASS="arrow"
>&#8594;</SPAN
> <SPAN CLASS="cmssi"
>n</SPAN
></P
></DD
><DT
><B
>Arguments and Values</B
></DT
><DD
><P CLASS="j"
><VAR CLASS="param"
>item</VAR
> &#8212; an <A HREF="26_1_Glossary.html#object"
><EM CLASS="term"
>object</EM
></A
>. </P
><P CLASS="j"
><VAR CLASS="param"
>sequence</VAR
> &#8212; a <A HREF="26_1_Glossary.html#proper_sequence"
><EM CLASS="term"
>proper sequence</EM
></A
>. </P
><P CLASS="j"
><VAR CLASS="param"
>predicate</VAR
> &#8212; a <A HREF="26_1_Glossary.html#designator"
><EM CLASS="term"
>designator</EM
></A
> for a <A HREF="26_1_Glossary.html#function"
><EM CLASS="term"
>function</EM
></A
> of one <A HREF="26_1_Glossary.html#argument"
><EM CLASS="term"
>argument</EM
></A
> that returns a <A HREF="26_1_Glossary.html#generalized_boolean"
><EM CLASS="term"
>generalized boolean</EM
></A
>. </P
><P CLASS="j"
><VAR CLASS="param"
>from-end</VAR
> &#8212; a <A HREF="26_1_Glossary.html#generalized_boolean"
><EM CLASS="term"
>generalized boolean</EM
></A
>. The default is <A HREF="26_1_Glossary.html#false"
><EM CLASS="term"
>false</EM
></A
>. </P
><P CLASS="j"
><VAR CLASS="param"
>test</VAR
> &#8212; a <A HREF="26_1_Glossary.html#designator"
><EM CLASS="term"
>designator</EM
></A
> for a <A HREF="26_1_Glossary.html#function"
><EM CLASS="term"
>function</EM
></A
> of two <A HREF="26_1_Glossary.html#argument"
><EM CLASS="term"
>arguments</EM
></A
> that returns a <A HREF="26_1_Glossary.html#generalized_boolean"
><EM CLASS="term"
>generalized boolean</EM
></A
>. </P
><P CLASS="j"
><VAR CLASS="param"
>test-not</VAR
> &#8212; a <A HREF="26_1_Glossary.html#designator"
><EM CLASS="term"
>designator</EM
></A
> for a <A HREF="26_1_Glossary.html#function"
><EM CLASS="term"
>function</EM
></A
> of two <A HREF="26_1_Glossary.html#argument"
><EM CLASS="term"
>arguments</EM
></A
> that returns a <A HREF="26_1_Glossary.html#generalized_boolean"
><EM CLASS="term"
>generalized boolean</EM
></A
>. </P
><P CLASS="j"
><VAR CLASS="param"
>start</VAR
>, <VAR CLASS="param"
>end</VAR
> &#8212; <A HREF="26_1_Glossary.html#bounding_index_designator"
><EM CLASS="term"
>bounding index designators</EM
></A
> of <VAR CLASS="param"
>sequence</VAR
>. The defaults for <VAR CLASS="param"
>start</VAR
> and <VAR CLASS="param"
>end</VAR
> are <CODE CLASS="f"
>0</CODE
> and <SPAN CLASS="misc"
><B
>nil</B
></SPAN
>, respectively. </P
><P CLASS="j"
><VAR CLASS="param"
>key</VAR
> &#8212; a <A HREF="26_1_Glossary.html#designator"
><EM CLASS="term"
>designator</EM
></A
> for a <A HREF="26_1_Glossary.html#function"
><EM CLASS="term"
>function</EM
></A
> of one argument, or <SPAN CLASS="misc"
><B
>nil</B
></SPAN
>. </P
><P CLASS="j"
><VAR CLASS="param"
>n</VAR
> &#8212; a non-negative <A HREF="26_1_Glossary.html#integer"
><EM CLASS="term"
>integer</EM
></A
> less than or equal to the <A HREF="26_1_Glossary.html#length"
><EM CLASS="term"
>length</EM
></A
> of <VAR CLASS="param"
>sequence</VAR
>.</P
></DD
><DT
><B
>Description</B
></DT
><DD
><P CLASS="j"
><A HREF="f_count.html" CLASS="funref"
><B
>count</B
></A
>, <A HREF="f_count.html" CLASS="funref"
><B
>count-if</B
></A
>, and <A HREF="f_count.html" CLASS="funref"
><B
>count-if-not</B
></A
> count and return the number of <A HREF="26_1_Glossary.html#element"
><EM CLASS="term"
>elements</EM
></A
> in the <VAR CLASS="param"
>sequence</VAR
> <A HREF="26_1_Glossary.html#bounded"
><EM CLASS="term"
>bounded</EM
></A
> by <VAR CLASS="param"
>start</VAR
> and <VAR CLASS="param"
>end</VAR
> that <A HREF="26_1_Glossary.html#satisfy_the_test"
><EM CLASS="term"
>satisfy the test</EM
></A
>. </P
><P CLASS="j"
>The <VAR CLASS="param"
>from-end</VAR
> has no direct effect on the result. However, if <VAR CLASS="param"
>from-end</VAR
> is <A HREF="26_1_Glossary.html#true"
><EM CLASS="term"
>true</EM
></A
>, the <A HREF="26_1_Glossary.html#element"
><EM CLASS="term"
>elements</EM
></A
> of <VAR CLASS="param"
>sequence</VAR
> will be supplied as <A HREF="26_1_Glossary.html#argument"
><EM CLASS="term"
>arguments</EM
></A
> to the <VAR CLASS="param"
>test</VAR
>, <VAR CLASS="param"
>test-not</VAR
>, and <VAR CLASS="param"
>key</VAR
> in reverse order, which may change the side-effects, if any, of those functions.</P
></DD
><DT
><B
>Examples</B
></DT
><DD
><PRE CLASS="screen"
>(count #\a "how many A's are there in here?") <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 2
(count-if-not #'oddp '((1) (2) (3) (4)) :key #'car) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 2
(count-if #'upper-case-p "The Crying of Lot 49" :start 4) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 2</PRE
></DD
><DT
><B
>Exceptional Situations</B
></DT
><DD
><P CLASS="j"
>Should be prepared to signal an error of <A HREF="26_1_Glossary.html#type"
><EM CLASS="term"
>type</EM
></A
> <A HREF="t_type-error.html" CLASS="typeref"
><B
>type-error</B
></A
> if <VAR CLASS="param"
>sequence</VAR
> is not a <A HREF="26_1_Glossary.html#proper_sequence"
><EM CLASS="term"
>proper sequence</EM
></A
>.</P
></DD
><DT
><B
>See Also</B
></DT
><DD
><P CLASS="j"
><A HREF="17_2_Rules_about_Test_Functions.html#sec_17_2" CLASS="secref"
><SPAN CLASS="cmr"
>Section</SPAN
> <SPAN CLASS="cmr"
>17.2</SPAN
> <SPAN CLASS="cmr"
>(Rules</SPAN
> <SPAN CLASS="cmr"
>about</SPAN
> <SPAN CLASS="cmr"
>Test</SPAN
> <SPAN CLASS="cmr"
>Functions)</SPAN
></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"
>The <SPAN CLASS="kwd"
><SPAN CLASS="cmtt"
>:test-not</SPAN
></SPAN
> <A HREF="26_1_Glossary.html#argument"
><EM CLASS="term"
>argument</EM
></A
> is deprecated. </P
><P CLASS="j"
>The <A HREF="26_1_Glossary.html#function"
><EM CLASS="term"
>function</EM
></A
> <A HREF="f_count.html" CLASS="funref"
><B
>count-if-not</B
></A
> is deprecated.</P
></DD
></DL
></DIV
></DIV
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><DIV CLASS="btmnav"
><A HREF="f_reduce.html" CLASS="prev"
>&#8592;</A
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