[ isa ]
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.
- Syntax
null->isA(::typetocheck)
null->isA('typetocheck')
Examples
- Beginner
- Intermediate
To check the type of an object:
Use the [Null->IsA] tag. The following example checks a local to see whether it is a string before performing a string operation on it.
Code
local(mystring='red,green,blue')
if(#mystring->isA('string')) => {
local(myarray = #mystring->split(','))
else
local(myarray = array)
}
#myarrayResult
array(red, green, blue)
Check to see if a thread variable is initialised — if not redefine it.
Code
! var(myvar)->isA(::array)
? $myvar = array('a','b','c')
$myvarResult
array(a, b, c)
Please note that periodically LassoSoft will go through the notes and may incorporate information from them into the documentation. Any submission here gives LassoSoft a non-exclusive license and will be made available in various formats to the Lasso community.
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