A good simple use case for fold-left() is to accumulate a running total, i.e.
turn (1,2,3,4) into (1,3,6,10).
I have to confess I always find it difficult to come up with a convincing use
case for fold-right().
Michael Kay
Saxonica
On 7 Mar 2019, at 11:45, Martin Honnen martin(_dot_)honnen(_at_)gmx(_dot_)de
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
Am 07.03.2019 um 12:23 schrieb Mukul Gandhi
gandhi(_dot_)mukul(_at_)gmail(_dot_)com:
I've updated the document I've prepared, at the same link
(http://gandhimukul.tripod.com/xslt/xslt_repetition_constructs.pdf)
discussing fold-left() and fold-right() functions as well.
The examples for those two functions seem a bit artificial as the problem
they solve could be easily solved with
string-join($inpValues, '.')
respectively
string-join(reverse($inpValues), '.')
in earlier XPath versions without any need for higher-order functions and
recursion or just as well at the XSLT level with
<xsl:value-of select="$inputValues" separator="."/>
respectively
<xsl:value-of select="reverse($inputValues)" separator="."/>
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