Subject: Re: [xsl] Working around immutable variables From: "David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Fri, 2 Mar 2018 22:25:59 -0000 |
> My non-xsl mind wants to use a mutable variable: You should worry, your mind has been corrupted by exposure to unnatural imperative programming languages:-) If you were describing the problem to a human, you would not start with "initialize a variable $current_region" The XSLT version far more closely follows your english description > we would like to show the first region name only to avoid repetition. <xsl:for-each-group select="row" group-by select="region"> <xsl:value-of select="current-grouping-key()"/> <xsl:for-each select="current-group()"> do something with all the rows with this <region>US</region> or whatever </xsl:for-each> </xsl:for-each-group> assuming an input like <row><region>US</region>...</row> <row><region>US</region>...</row> <row><region>Europe</region>...</row> So not only do you not need mutable variables, you don't need a variable at all. David
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