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Re: XPath +/- etc not first class functions

  • From: Ihe Onwuka <ihe.onwuka@gmail.com>
  • To: Michael Kay <mike@saxonica.com>
  • Date: Mon, 28 Aug 2017 14:12:44 -0400

Re:  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.

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