not()

Function group	Execute on client	Platform(s)
General	YES	All

Syntax

not(expression)

Description

Returns the logical Not of an expression.

All expressions in Omnis have a Boolean (truth) value. Firstly, non-zero numeric values (including negative values) are TRUE, zero values are FALSE. Secondly, string values are TRUE or FALSE depending on their numeric equivalent. String '1' has boolean value 1, therefore not('1') is 0. 'Bill' has boolean value 0, 'YES' has numeric value 0.

The numeric value of an expression that evaluates to true is 1, therefore not(true) is 0. Similarly, not(false) is 1.

You can also use not() to make method code more readable.

Example

Calculate
 
lVar1
 as 
not
(2501)

# returns 0

 
Calculate
 
lVar1
 as 
not
(
'Hello there!'
)

# is the same as not(0) which returns 1

 
Calculate
 
lVar1
 as 
not
(31<45)

# is the same as not(true) which returns false

 
Do method
 
ProcessList
 
Returns 
Done

If
 
not
(
Done
)

  
# do something

End If
# can be used to make code more readable