XML.orgXML.org
FOCUS AREAS |XML-DEV |XML.org DAILY NEWSLINK |REGISTRY |RESOURCES |ABOUT
OASIS Mailing List ArchivesView the OASIS mailing list archive below
or browse/search using MarkMail.

 


Help: OASIS Mailing Lists Help | MarkMail Help

[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index]
Re: [xml-dev] XPath +/- etc not first class functions



On Mon, Aug 28, 2017 at 4:47 AM, Michael Kay <mike@saxonica.com> wrote:
The absence of an example in the spec doesn't mean that something can't be done. (The XPath expression //.. never appears in the spec, but it is perfectly legal and even potentially useful).

But yes. + and - are operators (not "primitives"), and operators are not functions. You can easily wrap a function around an operator:

function($x, $y) {$x + $y}

and pass this function to higher-order functions such as fold-left, but you cannot pass the operator itself.

Well Mike it wasn't so much the absence but rather the presence of the example of the function wrapped + function. I thought why is he doing that if he doesn't have to.



[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index]


News | XML in Industry | Calendar | XML Registry
Marketplace | Resources | MyXML.org | Sponsors | Privacy Statement

Copyright 1993-2007 XML.org. This site is hosted by OASIS