What Are "Anonymous Functions" In JScript?


	What Are "Anonymous Functions" In JScript?
prostoalex
2-26-2008 5:44 PM
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tags:
javascript, programming, development, webdev
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/2d415819-3fca-40dc-aca8-b13f3543ab6b/F4C074DD-2E9B-45F4-8B07-6946EA1EA49D/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx" href="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx" style="font-size: 11px;">blogs.msdn.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><H4 class="BlogPostHeader">What Are "Anonymous Functions" In JScript? </H4></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><SPAN>One
        of our excellent customer support staff in the 
        <ST1:COUNTRY-REGION _moz-userdefined="" w:st="on">
            <ST1:PLACE _moz-userdefined="" w:st="on">United Kingdom</ST1:PLACE>
        </ST1:COUNTRY-REGION>
        asked me this morning what "anonymous functions" are in JScript.<O:P _moz-userdefined=""></O:P>
        </SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><SPAN>It's
        a little complicated. Two things come to mind: realio-trulio anonymous functions,
        and what we used to call "scriptlets".<O:P _moz-userdefined=""></O:P>
        </SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><SPAN>First
        up are actual anonymous functions -- functions which do not have names are, unsurprisingly
        enough, called "anonymous functions".<O:P _moz-userdefined=""></O:P>
        </SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><P class="MsoNormal">
        <SPAN>"<B>What
        the heck do you mean, functions without names</B>?" I hear you ask.<SPAN>  </SPAN>"<B>Surely
        all functions have names!"</B> -- well, no, actually, some don't.<SPAN>  </SPAN>This
        is perfectly legal in JScript:<O:P _moz-userdefined=""></O:P>
        </SPAN>
    </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><SPAN>print
        ( <SPAN>function(x){return x * 2;}</SPAN> (3)
        );<O:P _moz-userdefined=""></O:P>
        </SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><SPAN>That
        prints out "6".<SPAN>  </SPAN>What's the name of that
        function?<SPAN>  </SPAN>It has no name.<SPAN>  </SPAN>Of
        course, we could give it one if we chose.<SPAN>  </SPAN>This
        is exactly the same as declaring a named function:<O:P _moz-userdefined=""></O:P>
        </SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><P class="MsoNormal">
        <SPAN>function
        double(x){return x * 2;}</SPAN><SPAN>
        <O:P _moz-userdefined=""></O:P>
        </SPAN>
    </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><SPAN>print
        ( double(3) );<O:P _moz-userdefined=""></O:P>
        </SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://blogs.msdn.com/ericlippert/archive/2003/09/16/53021.aspx"><SPAN>But
        functions don't need names any more than strings or numbers do.<SPAN>  </SPAN>Functions
        are just functions whether they’re named or not.<O:P _moz-userdefined=""></O:P>
        </SPAN></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/F4C074DD-2E9B-45F4-8B07-6946EA1EA49D/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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