When to use || vs. OR in ColdFusion in a <cfif>?

Wh开发者_JS百科en do I use an "OR" vs a || in a ColdFusion cfif statement?

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Double pipe (as well as double ampersand) are supported in ColdFusion since CF8. Since learning that, I always use double pipe/double ampersand instead of OR/AND. The reason why I code with this style is that "OR" is not completely descriptive with regards to the operation being performed. There's bitwise-OR, logical-OR, and logical-OR with short-circuiting.

Bitwise OR: 01 | 10 = 11

Logical OR: buildErrorsOn(form.varA) | buildErrorsOn(form.varB)

Logical OR (short-circuit): isDefined('url.doStuff') || isDefined('url.doStuff')

In just about any language you could use right now (Oracle seeming to be a notable exception), double pipe always means Logical-OR with short-circuiting. It's a precise notation.

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I prefer || in CFSCRIPT and OR in CFML.

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There may be support in CF9 that brings parity to those keywords, though I couldn't find a reference to indicate that. Really, you are probably better off just using the OR keyword in CFIF, and saving the || for string concatenation in SQL queries.

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It looks like || has been supported since CF8. CF8 documentation

I always find "or" more intuitive. (For that matter, I always use "+" for string concatenation in SQL - or is that exclusive to SQL Server?)

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Not sure about this, but it would appear that a cfif statement only supports OR, so the answer to your question is 'always'. See this:

• http://coldfusion.sys-con.com/node/44479