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RE: [xsl] Functional Programming: How do I convert an xsl:for-each loop into a functional style?
Subject: RE: [xsl] Functional Programming: How do I convert an xsl:for-each loop into a functional style? From: "Costello, Roger L." <costello@xxxxxxxxx> Date: Thu, 21 Jan 2010 11:03:52 -0500 |
Thanks everyone for your responses. They have been very enlightening. However, I am struggling to characterize what "functional programming" means. How will I recognize that one XSLT program is written in a functional style while another is not? Let's take an example. Suppose I want to execute Statement 1 if Number is greater than 20, and Statement 2 if Number is greater than 10. Here's one way to implement this: <xsl:choose> <xsl:when test="Number gt 20"> Statement 1 </xsl:when> <xsl:when test="Number gt 10"> Statement 2 </xsl:when> </xsl:choose> Suppose Number has the value 25. If the two xsl:when tests can be executed in any order, then Statement 2 could be executed, which is not what I desire. Thus, I conclude, this xsl:choose is not written in a functional style. Do you agree? Now, let me recast the implementation: <xsl:choose> <xsl:when test="Number gt 20"> Statement 1 </xsl:when> <xsl:when test="(Number gt 10) and (Number le 20)"> Statement 2 </xsl:when> </xsl:choose> Now I get the desired results no matter what order the xsl:when tests are executed. Thus, I conclude, this xsl:choose is written in a functional style. Do you agree? /Roger
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