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not() Function

Function

not( value )

Converts true into false, and false into true.

See also:

  • if(): Evaluates a logical statement and returns different results if the logical statement returns true or false.
  • true(): Returns the Boolean value true.
  • false(): Returns the Boolean value false.

Parameters

Keyword Type Description

value

Boolean

A Boolean or array of Booleans to be toggled.

Returns

Boolean

Usage considerations

  • All values are cast to a Boolean before evaluating the not(). If any values cannot be cast to a Boolean, the function returns an error.
  • not() can accept a list of values. If a list is provided, the result returns a list of the same length with each input value evaluated.
  • A list of values can either be provided using separate arguments or a list of values. For example, the following expressions return the same result:
    • not({true, true, false})
    • not(true, true, false)
  • If a list of lists is provided, the list is flattened before evaluating the not() function.
  • The not() function returns an error if any values provided are null.

If it's possible that the input value to the not() function could be null, an alternate approach is to do a comparison against the false() function using the <> operator. For example, the following expressions result in the same outcome if local!value is true or false. However, if local!value is null, the first expression will return an error, while the second expression returns true.

  • not(local!value)
  • local!value <> false

Examples

Using not() within an if() statement

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if(
  not(
    a!isUserMemberOfGroup(
      username: loggedInUser(),
      groups: cons!MY_GROUP
    )
  ),
  "Not Authorized",
  "Authorized",
)

Returns "Not Authorized" if the user is not in the group.

When using not() in a logical function, the expression can usually be simplified to avoid using not(). In this example, you can remove not() from the if() condition and switch the values for the true and false outcomes. This has the same result and will be easier for another developer to read and understand.

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if(
    a!isUserMemberOfGroup(
      username: loggedInUser(),
      groups: cons!MY_GROUP
    ),
  "Authorized",
  "Not Authorized",
)

Using not() to change the selected style of a button

Paste this example into an interface to see the result.

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a!localVariables(
  local!selected: true,
  a!buttonWidget(
    label: if(
      local!selected,
      "Selected",
      "Not Selected"
    ),
    style: if(
      local!selected,
      "PRIMARY",
      "NORMAL"
    ),
    value: not(local!selected),
    saveInto: local!selected
  )
)

When the button is selected, the variable value is flipped from true to false or vice versa.

Feature compatibility

The table below lists this function's compatibility with various features in Appian.
Feature Compatibility Note
Portals Compatible
Offline Mobile Compatible
Sync-Time Custom Record Fields Compatible

Can be used to create a custom record field that only evaluates at sync time.

Real-Time Custom Record Fields Incompatible

Custom record fields that evaluate in real time must be configured using one or more Custom Field functions.

Process Reports Compatible
Process Events Compatible
Open in Github Built: Mon, Apr 22, 2024 (07:50:54 PM)

not() Function

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