User Guide : Scripting : Writing Expressions : Basic Elements of an Expression
 
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Basic Elements of an Expression
There are five basic elements of an expression:
Operands
Operators
Parentheses
Functions
Statements
Operands
Operands are values or text that the formula operates on. These may be actual values such as "4", or field names (including text or numeric fields).
Operators
Operators are mathematical symbols, text characters, or logical statements that indicate to the application what must be done with the operands in a formula. The scripting operators are similar to those in Microsoft Excel.
There are several types of operators:
Arithmetic Operators
Assignment Operator
Logical Operators
Comparison Operators
Concatenation Operator
Parentheses
You can use parentheses in complex formulas to determine the order in which you want formulas calculated. Operations within parentheses are executed first.
See Precedence in Evaluating Expressions.
Example of Nested Parentheses
(Field + Field * (Field - Field)/ Field)
Functions
Functions are snippets of code that perform specific tasks. Use them in expressions to manipulate data or filter records. The functions available are similar to the functions in Visual Basic.
Statements
Statements are standalone elements used to form programs. Statements often call functions and include internal components such as expressions.