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Chapter 3: Variables, Expressions & Operators
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Expressions
An expression is a combination of values, variables, and/or other expressions
separated by operators, or simply a single value or variable.
The following are examples of expressions:
'Friday'
1+3
$A + $B
4.0
$E = $M * $C^2
$String1 EQ $String2
$Browser.type
$Variable = 4 + 3
$Form.name
$X = $A + $B
$Variable = (34 GE 341)
$LastName = 'Smith'
Values
Values used in expressions can be any of the following:
•
Variables of the form $varname
•
String literals of the form 'string text'
•
Numbers of the form x or x.x
•
Numbers using scientific notation of the form xEy, xey, xDy, or xdy, where x is
any real number and y is a positive or negative exponent. For example, 2E6 is
the same as 2 * 106. Note that in ION Script there is no difference between the
characters e, E, d, and D.
•
Booleans of the form TRUE, FALSE, true, or false. For example,
$A EQ TRUE
Expression Types
There are three main types of expressions. They are:
ION guide
•
Numeric expressions
•
Boolean expressions
•
String expressions
Expressions