202 lines
4.1 KiB
HTML
202 lines
4.1 KiB
HTML
|
<!DOCTYPE HTML>
|
||
|
|
<HTML LANG="en-us"
|
||
|
|
><HEAD
|
||
|
|
><TITLE
|
||
|
|
>identity | Common Lisp Nova Spec</TITLE
|
||
|
|
><META CHARSET="US-ASCII"
|
||
|
|
><LINK REL="canonical" HREF="f_identity.html"
|
||
|
|
><LINK REL="next" HREF="f_complement.html" TYPE="text/html" TITLE="complement"
|
||
|
|
><LINK REL="prev" HREF="f_equalp.html" TYPE="text/html" TITLE="equalp"
|
||
|
|
><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_identity.html"
|
||
|
|
>identity</A
|
||
|
|
></SPAN
|
||
|
|
></DIV
|
||
|
|
><DIV CLASS="apropos"
|
||
|
|
><DIV CLASS="apropos-io"
|
||
|
|
><A HREF="f_equalp.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_complement.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="identity"
|
||
|
|
></SPAN
|
||
|
|
><B
|
||
|
|
>identity</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
|
||
|
|
>identity</B
|
||
|
|
> <SPAN CLASS="cmssi"
|
||
|
|
>object</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"
|
||
|
|
>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"
|
||
|
|
>Returns its argument <VAR CLASS="param"
|
||
|
|
>object</VAR
|
||
|
|
>.</P
|
||
|
|
></DD
|
||
|
|
><DT
|
||
|
|
><B
|
||
|
|
>Examples</B
|
||
|
|
></DT
|
||
|
|
><DD
|
||
|
|
><PRE CLASS="screen"
|
||
|
|
>(identity 101) <SPAN CLASS="cmsy"
|
||
|
|
><SPAN CLASS="arrow"
|
||
|
|
>→</SPAN
|
||
|
|
></SPAN
|
||
|
|
> 101
|
||
|
|
(mapcan #'identity (list (list 1 2 3) '(4 5 6))) <SPAN CLASS="cmsy"
|
||
|
|
><SPAN CLASS="arrow"
|
||
|
|
>→</SPAN
|
||
|
|
></SPAN
|
||
|
|
> (1 2 3 4 5 6)</PRE
|
||
|
|
></DD
|
||
|
|
><DT
|
||
|
|
><B
|
||
|
|
>Notes</B
|
||
|
|
></DT
|
||
|
|
><DD
|
||
|
|
><P CLASS="j"
|
||
|
|
><A HREF="f_identity.html" CLASS="funref"
|
||
|
|
><B
|
||
|
|
>identity</B
|
||
|
|
></A
|
||
|
|
> is intended for use with functions that require a <A HREF="26_1_Glossary.html#function"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>function</EM
|
||
|
|
></A
|
||
|
|
> as an argument. </P
|
||
|
|
><P CLASS="j"
|
||
|
|
><CODE CLASS="f"
|
||
|
|
>(eql x (identity x))</CODE
|
||
|
|
> returns <A HREF="26_1_Glossary.html#true"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>true</EM
|
||
|
|
></A
|
||
|
|
> for all possible values of <VAR CLASS="param"
|
||
|
|
>x</VAR
|
||
|
|
>, but <CODE CLASS="f"
|
||
|
|
>(eq x (identity x))</CODE
|
||
|
|
> might return <A HREF="26_1_Glossary.html#false"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>false</EM
|
||
|
|
></A
|
||
|
|
> when <VAR CLASS="param"
|
||
|
|
>x</VAR
|
||
|
|
> is a <A HREF="26_1_Glossary.html#number"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>number</EM
|
||
|
|
></A
|
||
|
|
> or <A HREF="26_1_Glossary.html#character"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>character</EM
|
||
|
|
></A
|
||
|
|
>. </P
|
||
|
|
><P CLASS="j"
|
||
|
|
><A HREF="f_identity.html" CLASS="funref"
|
||
|
|
><B
|
||
|
|
>identity</B
|
||
|
|
></A
|
||
|
|
> could be defined by</P
|
||
|
|
><PRE CLASS="screen"
|
||
|
|
>(defun identity (x) x)</PRE
|
||
|
|
></DD
|
||
|
|
></DL
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><DIV CLASS="footer"
|
||
|
|
><DIV CLASS="btmnav"
|
||
|
|
><A HREF="f_equalp.html" CLASS="prev"
|
||
|
|
>←</A
|
||
|
|
><A HREF="f_complement.html" CLASS="next"
|
||
|
|
>→</A
|
||
|
|
></DIV
|
||
|
|
><DIV CLASS="trail"
|
||
|
|
>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><SCRIPT
|
||
|
|
>domReady();</SCRIPT
|
||
|
|
></BODY
|
||
|
|
></HTML
|
||
|
|
>
|