Table script - completed?

[#1]

When triggering a Tables script from another script, how can I check if a table script was completed (without errors)?

Adding a return function is not allowed:

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
dt << run Script( "Bivariate" );
dt << New Script(
	"test", JSL Quote(
		print(1);
		return(1);	
),As String( 1 ));


dt << New Script(
	"test2", JSL Quote(
		New Namespace("myScript");
		myScript:finished=0;
print(1);
myScript:finished=1;
),
	As String( 1 )
);

If( Not( dt << run Script( "test" ) ),
	Stop()
);

dt << run Script( "test2" );
If( Not( myScript:finished ),
	Stop()
);

[#2 · Accepted solution]

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );

dt << deletescripts( "test" );

dt << New Script(
	"test", JSL Quote(
		if(test<0,
			0 // either this is the last value from the if
		,
			print("ok");
			1 // or this is the last value from the if
		); // the if() value is either 0 or 1
	), // the script's value is the last statement executed value
	As String( 1 )
);

test = 37;
Show( test, dt << run Script( "test" ) ); // "ok",1

test = -42;
Show( test, dt << run Script( "test" ) ); // 0

 edit: include() works the same way.

[#3]

Oh, so simple :)

Thanks @Craige_Hales 

[#4]

For functions there is no difference between the two variants? 

testFunc1= Function({},return(1));
testFunc2= Function({},1);

show(testFunc1);
show(testFunc2);

[#5]

return(1) has a major advantage if it is nested inside for loops and if statements: it returns the answer without needing to be otherwise positioned to be the last expression evaluated. The implementation of the return(1) in C++ is slower than just ending with the desired expression; you'll notice on short functions that are called millions of times. So in your example I tend to write

testFunc2= Function({},
 /*return*/ 1
);

with the comment. Or use return(1) if clarity is more important. The break() and continue() statements work much the same. Using them for clarity, or in a way that executes them infrequently is perfect.

[#6]

Nice idea with the /*return*/ comment.

I already deleted one of my "1"s - because it looked so unnecessary ;)
Some days later, without the direct connection to the deleted "1", it was quite hard to find out what's going wrong ...