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<cfset aVar = anotherVar + 1>
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The preceding line of code sets aVar to the current value of anotherVar plus one.
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3 Using ColdFusion MX Tags and Functions
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A function takes one or more arguments and returns a single value. For a list of all ColdFusion functions, see the Alphabetical Listing of Functions in 45. A typical function call looks as follows:
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Trim(myVar) Trim() is a ColdFusion function that takes a string and returns that string with all leading and trailing white space removed.
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Some functions take no arguments. Now(), for example, doesn t need any arguments, because it always returns the current date and time. Some functions take multiple arguments. Max(), for example, takes two arguments, as follows, and returns whichever argument is higher:
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Max(thisVar, thatVar)
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Writing an application in ColdFusion without encountering pound signs is nearly impossible. Unfortunately, some of the rules for where and where not to use them are a bit confusing. In this section, you see where and, more important, where not to use pound signs in your ColdFusion code.
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Where and where not to use pound signs
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The most important guideline for pound sign usage is that, if you don t need pound signs, don t use them. Take, for example, the following expression:
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<cfif #varA# GT #varB#> <cfset #myVar# = #Trim( #thisVar##thatVar# )#> </cfif>
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This example may seem an unreadable section of code, but snippets such as this one are prevalent in the ColdFusion world. The good news is that reducing the pound signs in any expression is easy because pound signs are often unnecessary. The unreadable section that we show here can be reworked as follows:
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<cfif varA GT varB> <cfset myVar = Trim(thisVar & thatVar)> </cfif>
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Hard to believe, but all those pound signs were unnecessary. The following section tells you why.
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The six rules of pound sign usage
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If you use the following six rules as your guide to using pound signs, your code is sure to be easy to understand and maintain:
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Part I Getting Started with ColdFusion MX
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1. Use pound signs inside tag attributes. Consider, for example, the following call to CFLOOP:
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<cfloop from= #varA# to= #varB# index= i >
This call is telling ColdFusion, Evaluate the variables varA and varB and place their values in the from and to attributes, respectively. The i doesn t have pound signs surrounding it because you are not evaluating its contents; you are telling ColdFusion, Create a local variable named i if it doesn t already exist and use this variable to contain the value of the loop index while the template executes. You know how to interpret such things by understanding exactly what each tag and function does. Reading the Language Reference (Part IX) at the end of this book is a good start. 2. Use pound signs if you are in clear text between the opening and closing tags of any ColdFusion tag, as in the following example:
<cfif varA GT varB> #varA# is greater than #varB# </cfif>
Don t use pound signs inside the CFIF tag itself but do use pound signs between <cfif> and </cfif>. 3. Use pound signs around variables inside of strings in ColdFusion expressions, as in the following example:
<cfset aVar = My name is #First# #Last#. >
You use pound signs in this case, even though you are inside a CFSET tag, because you want ColdFusion to evaluate FirstName and LastName inside of the string. 4. Don t use pound signs around variables or functions inside of CFIF or CFSET tags, unless you are inside of a string. Take, for example, the following snippet:
<cfif #varA# GT #varB#> <cfset #myVar# = #Trim( #thisVar##thatVar# )#> </cfif>
You can reduce it as follows:
<cfif varA GT varB> <cfset myVar = Trim( #thisVar##thatVar# )> </cfif>
You can remove the pound signs around varA and varB because they occur inside a CFIF tag, and you can remove the pound signs around myVar and the call to Trim() because they occur inside a CFSET. The remaining pound signs stay because you must use pound signs in string expressions. 5. If a variable or function call is inside a string in a ColdFusion expression, but that string contains only variables and/or function calls, you should rewrite the expression so that you don t use pound signs. Take, for example, the following expression:
<cfset myVar = Trim( #thisVar##thatVar# )>
This expression calls Trim(), passing thisVar and thatVar concatenated together into one string. The expression would be more readable, however, if it used the string concatenation operator (&), as in the following example: