263 lines
No EOL
5.3 KiB
HTML
263 lines
No EOL
5.3 KiB
HTML
<!DOCTYPE HTML>
|
|
<HTML LANG="en-us"
|
|
><HEAD
|
|
><TITLE
|
|
>nth-value | Common Lisp Nova Spec</TITLE
|
|
><META CHARSET="US-ASCII"
|
|
><LINK REL="canonical" HREF="f_nth-value.html"
|
|
><LINK REL="next" HREF="f_prog.html" TYPE="text/html" TITLE="prog, prog*"
|
|
><LINK REL="prev" HREF="v_multiple-values-limit.html" TYPE="text/html" TITLE="multiple-values-limit"
|
|
><LINK REL="up" HREF="5_3_Data_and_Control_Flow_Dictionary.html" TYPE="text/html" TITLE="5.3 Data and Control Flow Dictionary"
|
|
><LINK REL="start" HREF="index.html" TYPE="text/html" TITLE="Common Lisp Nova Spec"
|
|
><META NAME="VIEWPORT" CONTENT="width=device-width, initial-scale=1.0"
|
|
><LINK REL="STYLESHEET" HREF="dpans.css%3F3909942064.css"
|
|
><SCRIPT SRC="dpans.js%3F3909942064"
|
|
></SCRIPT
|
|
><SCRIPT SRC="apropos.js%3F3909942064"
|
|
></SCRIPT
|
|
></HEAD
|
|
><BODY
|
|
><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"
|
|
>→ <A HREF="5_Data_and_Control_Flow.html"
|
|
>5. Data and Control Flow</A
|
|
></SPAN
|
|
> <SPAN CLASS="breadcrumb-item"
|
|
>→ <A HREF="5_3_Data_and_Control_Flow_Dictionary.html"
|
|
>5.3 Data and Control Flow Dictionary</A
|
|
></SPAN
|
|
> <SPAN CLASS="breadcrumb-item"
|
|
>→ <A HREF="f_nth-value.html"
|
|
>nth-value</A
|
|
></SPAN
|
|
></DIV
|
|
><DIV CLASS="apropos"
|
|
><DIV CLASS="apropos-io"
|
|
><A HREF="v_multiple-values-limit.html" CLASS="prev"
|
|
>←</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);"
|
|
><A HREF="f_prog.html" CLASS="next"
|
|
>→</A
|
|
></DIV
|
|
><DIV ID="apropos-res"
|
|
></DIV
|
|
></DIV
|
|
></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="nth-value"
|
|
></SPAN
|
|
><B
|
|
>nth-value</B
|
|
></TD
|
|
><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
|
|
><I
|
|
>Macro</I
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
><HR
|
|
></DIV
|
|
><UL CLASS="subtoc"
|
|
></UL
|
|
><DL
|
|
><DT
|
|
><B
|
|
>Syntax</B
|
|
></DT
|
|
><DD
|
|
><P CLASS="j"
|
|
><B
|
|
>nth-value</B
|
|
> <SPAN CLASS="cmssi"
|
|
>n</SPAN
|
|
> <SPAN CLASS="cmssi"
|
|
>form</SPAN
|
|
> <SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
> <SPAN CLASS="cmssi"
|
|
>object</SPAN
|
|
></P
|
|
></DD
|
|
><DT
|
|
><B
|
|
>Arguments and Values</B
|
|
></DT
|
|
><DD
|
|
><P CLASS="j"
|
|
><VAR CLASS="param"
|
|
>n</VAR
|
|
> — a non-negative <A HREF="26_1_Glossary.html#integer"
|
|
><EM CLASS="term"
|
|
>integer</EM
|
|
></A
|
|
>; evaluated. </P
|
|
><P CLASS="j"
|
|
><VAR CLASS="param"
|
|
>form</VAR
|
|
> — a <A HREF="26_1_Glossary.html#form"
|
|
><EM CLASS="term"
|
|
>form</EM
|
|
></A
|
|
>; evaluated as described below. </P
|
|
><P CLASS="j"
|
|
><VAR CLASS="param"
|
|
>object</VAR
|
|
> — an <A HREF="26_1_Glossary.html#object"
|
|
><EM CLASS="term"
|
|
>object</EM
|
|
></A
|
|
>.</P
|
|
></DD
|
|
><DT
|
|
><B
|
|
>Description</B
|
|
></DT
|
|
><DD
|
|
><P CLASS="j"
|
|
>Evaluates <VAR CLASS="param"
|
|
>n</VAR
|
|
> and then <VAR CLASS="param"
|
|
>form</VAR
|
|
>, returning as its only value the <VAR CLASS="param"
|
|
>n</VAR
|
|
>th value <A HREF="26_1_Glossary.html#yield"
|
|
><EM CLASS="term"
|
|
>yielded</EM
|
|
></A
|
|
> by <VAR CLASS="param"
|
|
>form</VAR
|
|
>, or <SPAN CLASS="misc"
|
|
><B
|
|
>nil</B
|
|
></SPAN
|
|
> if <VAR CLASS="param"
|
|
>n</VAR
|
|
> is greater than or equal to the number of <A HREF="26_1_Glossary.html#value"
|
|
><EM CLASS="term"
|
|
>values</EM
|
|
></A
|
|
> returned by <VAR CLASS="param"
|
|
>form</VAR
|
|
>. (The first returned value is numbered <CODE CLASS="f"
|
|
>0</CODE
|
|
>.)</P
|
|
></DD
|
|
><DT
|
|
><B
|
|
>Examples</B
|
|
></DT
|
|
><DD
|
|
><PRE CLASS="screen"
|
|
> (nth-value 0 (values 'a 'b)) <SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> A
|
|
(nth-value 1 (values 'a 'b)) <SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> B
|
|
(nth-value 2 (values 'a 'b)) <SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> NIL
|
|
(let* ((x 83927472397238947423879243432432432)
|
|
(y 32423489732)
|
|
(a (nth-value 1 (floor x y)))
|
|
(b (mod x y)))
|
|
(values a b (= a b)))
|
|
<SPAN CLASS="cmsy"
|
|
><SPAN CLASS="arrow"
|
|
>→</SPAN
|
|
></SPAN
|
|
> 3332987528, 3332987528, <A HREF="26_1_Glossary.html#true"
|
|
><EM CLASS="term"
|
|
>true</EM
|
|
></A
|
|
></PRE
|
|
></DD
|
|
><DT
|
|
><B
|
|
>See Also</B
|
|
></DT
|
|
><DD
|
|
><P CLASS="j"
|
|
><A HREF="f_multiple-value-list.html" CLASS="macref"
|
|
><B
|
|
>multiple-value-list</B
|
|
></A
|
|
>, <A HREF="f_nth.html" CLASS="funref"
|
|
><B
|
|
>nth</B
|
|
></A
|
|
></P
|
|
></DD
|
|
><DT
|
|
><B
|
|
>Notes</B
|
|
></DT
|
|
><DD
|
|
><P CLASS="j"
|
|
>Operationally, the following relationship is true, although <A HREF="f_nth-value.html" CLASS="macref"
|
|
><B
|
|
>nth-value</B
|
|
></A
|
|
> might be more efficient in some <A HREF="26_1_Glossary.html#implementation"
|
|
><EM CLASS="term"
|
|
>implementations</EM
|
|
></A
|
|
> because, for example, some <A HREF="26_1_Glossary.html#cons"
|
|
><EM CLASS="term"
|
|
>consing</EM
|
|
></A
|
|
> might be avoided.</P
|
|
><PRE CLASS="screen"
|
|
>(nth-value <VAR CLASS="param"
|
|
>n</VAR
|
|
> <VAR CLASS="param"
|
|
>form</VAR
|
|
>) <SPAN CLASS="cmsy"
|
|
><SPAN STYLE="font-size:16px;vertical-align:-2px"
|
|
>≡</SPAN
|
|
></SPAN
|
|
> (nth <VAR CLASS="param"
|
|
>n</VAR
|
|
> (multiple-value-list <VAR CLASS="param"
|
|
>form</VAR
|
|
>))</PRE
|
|
></DD
|
|
></DL
|
|
></DIV
|
|
></DIV
|
|
><DIV CLASS="footer"
|
|
><DIV CLASS="btmnav"
|
|
><A HREF="v_multiple-values-limit.html" CLASS="prev"
|
|
>←</A
|
|
><A HREF="f_prog.html" CLASS="next"
|
|
>→</A
|
|
></DIV
|
|
><DIV CLASS="trail"
|
|
>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
|
|
></DIV
|
|
></DIV
|
|
><SCRIPT
|
|
>domReady();</SCRIPT
|
|
></BODY
|
|
></HTML
|
|
> |