Adobe 38043740 Developing Applications - Page 112

DEVELOPING COLDFUSION 9 APPLICATIONS 107 The CFML Programming Language CFScript provides a compact and efficient way to write ColdFusion logic. Typical uses of CFScript include the following: • Simplifying and speeding variable setting • Building compact JavaScript-like flow control structures • Creating user-defined functions Because you use functions and expressions directly in CFScript, you do not have to surround each assignment or function in a cfset tag. Also, CFScript assignments are often faster than cfset tags. CFScript provides a set of decision and flow-control structures that are more familiar than ColdFusion tags to most programmers. In addition to variable setting, other operations tend to be slightly faster in CFScript than in tags. You can use CFScript to create user-defined functions, or UDFs (also known as custom functions). You call UDFs in the same manner that you call standard ColdFusion functions. UDFs are to ColdFusion built-in functions what custom tags are to ColdFusion built-in tags. Typical uses of UDFs include data manipulation and mathematical calculation routines. You cannot include ColdFusion tags in CFScript. However, some functions and CFScript statements are equivalent to commonly used tags. For more information, see "Tag equivalents in CFScript" on page 109. Comparing tags and CFScript The following examples show how you can use CFML tags and CFScript to do the same thing. Each example takes data submitted from a form and places it in a structure; if the form does not have a last name and department field, it displays a message. Using CFML tags Adding #Form.firstname# #Form.lastname# You must enter a Last Name and Department. Last updated 1/20/2012