Lasso Programming: Lasso Language Reference

[Null]

[Null] creates a null value.

The null value is the default value for newly created variables which are not defined and is returned from many tags as a default value.

The [Null] tag is most often used in comparisons to check whether a given value is empty.

Syntax
Parameters

[Null]

[If: (Variable: 'VariableName') == (Null)]
  ...
[/If]

Examples

To check whether an [Action_Param] is empty:

Compare it against the value of the [Null] tag. The following example displays a message if the [Action_Param] named Username is empty.

[If: (Action_Param: 'Username') == Null]
  No username was specified.
[/If]

Result:

No username was specified.

Related Entries

Category

Substitution

Array

Boolean

Decimal

Integer

Map

Pair

String


Tag Link	[Null]	Category	Data Type
Type	Substitution	Data Source	Any
Support	Preferred	Version	5.0
Output Type	Null	Security	None
Implementation		Sets	Lasso 5.0

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[Null]

Examples

To check whether an [Action_Param] is empty:

Result:

Related Entries

Substitution

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