ColdFusion Developer's Guide

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Beta Beta Beta Beta Beta Beta Beta Beta Beta Beta Operator precedence and evaluation ordering The order of precedence controls the order in which operators in an expression are evaluated. The order of precedence is as follows. (Some alternative names for operators, such as EQUALS and GREATER THAN OR EQUAL TO are omitted for brevity.) Unary +, Unary - ^ *, / \ MOD +, - & EQ, NEQ, LT, LTE, GT, GTE, CONTAINS, DOES NOT CONTAIN, ==, !=, >, >=,
Beta Beta Beta Beta Beta Beta Beta Beta Beta Beta Usage Example Nested functions Function1(Function2(Data)) Multiple arguments Function(Data1, Data2, Data3) String arguments Function('This is a demo') Function("This is a demo") Arguments that are expressions Function1(X*Y, Function2("Text")) All functions return values. In the following example, the cfset tag sets a variable to the value returned by the Now function: You can use the values returned by functions directly to create more complex expressions, as in the following example: Abs(Myvar)/Round(3.14159) For more information on how to insert functions in expressions, see “Using number signs” on page 92. Optional function arguments Some functions take optional arguments after their required arguments. If omitted, all optional arguments default to a predefined value. For example: ■ Replace("Eat and Eat", "Eat", "Drink") returns "Drink and Eat" ■ Replace("Eat and Eat", "Eat", "Drink", "All") returns "Drink and Drink" The difference in the results is because the Replace function takes an optional fourth argument that specifies the scope of replacement. The default value is “One,” which explains why only the first occurrence of “Eat” was replaced with “Drink” in the first example. In the second example, a fourth argument causes the function to replace all occurrences of “Eat” with “Drink”. Expression evaluation and functions It is important to remember that ColdFusion evaluates function attributes as expressions before it executes the function. As a result, you can use any ColdFusion expression as a function attribute. For example, consider the following lines: When ColdFusion server executes the second line, it does the following: 1. Determines that there is an expression with a string concatenation. Expressions 91
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Beta Contents Introduction . . . .
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Beta Chapter 8: Creating ColdFusion
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Beta About resource and sandbox sec
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Beta Refining your searches with zo
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Beta Authentication. . . . . . . .
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Beta Using WDDX. . . . . . . . . .
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Beta Sending outgoing messages . .
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Index A access client variables 412
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authentication application-based ex
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cfexit tag about 43 behavior of 296
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SetVariable 103 StructClear 134 Str
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caching 1144 curve chart considerat
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web services and 1306 when to use 2
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forms for updating 584 insert form
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adding custom header 1428 attachmen
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in user-defined functions 222 infor
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esponding to messages from ColdFusi
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Internet applications 19 ColdFusion
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functions for 502 generating multi-
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described 1539 example 1544 onIncom
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unions 609 user guide 609 using 599
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text 1470 retrieving, e-mail messag
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about 37, 74, 324, 400, 404, 417 bu
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web services, consuming 1319 web se
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V validating data types 83 form fie
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type conversions 1304 web services,
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