throw

A irScript throw statement is used to raise an error from the current point of execution. Such errors can be handled in irScript using try/catch/finally statements. A throw statement requires a single accompanying expression (of any type), used to provide additional context for error handlers:

var listOfErrors = [];

try 
{ 
throw 'Something bad happened'; 
} 
catch( error ) 
{ 
listOfErrors.Add( error.Value ); 
}

try 
{ 
throw { ErrorCode : 45, Message : 'Something \*really\* bad happened.' }; 
} 
catch( error ) 
{ 
if( error.Value.ErrorCode > 10 ) 
{ 
listOfErrors.Add( error.Value.Message ); 
} 
}

Inside a catch block, a caught error may be re-thrown by issuing another throw statement, using the caught error as the target:

var listOfErrors = []; 
try 
{ 
try 
{ 
throw 'Something bad happened'; 
} 
catch( e ) 
{ 
throw e; 
} 
} 
catch( e ) 
{ 
listOfErrors.Add( e.Value ); 
}

// listOfErrors now contains a single Text element 'Something bad happened'