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What You Must Know About Operators in ColdFusion!


The fabric of a program consists of expressions, large and small, stitched together with operators and interspersed with functions. The larger expressions as well as the functions themselves may be the result of development from a number of smaller expressions. An understanding of the operators and their correct usage is therefore very essential. This tutorial describes the various operators by presenting comprehensive examples of their usage tested on the MX 6.1 server. <CFScript> will be used in all the examples.

Author Info:
By: Jayaram Krishnaswamy
Rating: 4 stars4 stars4 stars4 stars4 stars / 21
August 22, 2005
TABLE OF CONTENTS:
  1. · What You Must Know About Operators in ColdFusion!
  2. · Conditional Operators
  3. · Logical Operators
  4. · String Operator

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What You Must Know About Operators in ColdFusion! - String Operator
(Page 4 of 4 )

ColdFusion has only one string (&) operator to contend with, unlike JavaScript which uses both & and + for string concatenation.

Operator Description Examples
& joins two pieces of text #x# & #y#
Example of usage
<cfscript>
firstName="James";
lastName="Bond";
WriteOutput("The first name is: " & #firstName#);
Writeoutput("<p></p>");
WriteOutput("The last name is: " & #lastName#);
Writeoutput("<p></p>");
writeOutput("The full name is: " & #firstName# & " " & #lastName#);
</cfscript>

Concatenated String:

Summary

A thorough understanding of the operators is essential for correctly combining smaller expressions to produce larger ones. While evaluating logical values, the outcome may come out as YES or NO, but the interpreter may not recognize it, resulting in a runtime error with a message saying variable 'YES' or 'NO' not found. You will be required to define 'YES' and 'NO' to be associated with 'TRUE' and 'FALSE'. This can be easily verified by commenting out the definitions of 'YES' and 'NO' in logical2.cfm. Also, care should be taken to pay attention to the precedence of operators for correct interpretation. The function evaluate(), introduced without much of an explanation, is a very useful function. It parses and evaluates the expression supplied as an argument, at run time.


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