| Tag Link | [Null->IsA] | Category | Tags |
|---|---|---|---|
| Type | Member | Source Available | No |
| Support | Preferred | Version | 6.0 |
| Change | Unchanged | Data Source | Any |
| Output Type | Boolean | Security | None |
| Implementation | LCAPI | Sets | Lasso 8.5, Lasso 8.0, Lasso 7.0, Lasso 6.0 |
Requires a type name as a parameter. Returns True if the base object is of that type or has that type as a parent type.
Note that Null is the base type for all objects in Lasso. Using [Null->Isa: 'Null'] will always return true. To check whether a value does not have a value it is better to use the === operator. [If: $value === Null] ... [/If].
[Null->(IsA: 'Type Name']
| Required Parameters | |
|---|---|
| Type Name | The type to check. |
To check the type of an object:
Use the [Null->IsA] tag. The following example checks a variable to see whether it is a string before performing a string operation on it.
[Variable: 'myString' = 'red,green,blue']
[If: $myString->(IsA: 'string')]
[Variable: 'myArray' = $myString->(Split: ',')]
[Else]
[Variable: 'myArray' = (Array)]
[/If]
[Output: $myArray]
(Array: (Red), (Green), (Blue))