Blog - 🤡-25- Comma Quirk

25th April 2025

Gah, just when you thought the JSE Optimisations were working in your favour.

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// Optimise For Loop
// by Jayenkai
// Created 2024/2/10

// GotoJSE.com/KjXtDqv9.BAS

Graphics 512,512,1

Dim k(10,10)
k(1,3)=123

s=Mills()
mcSquared=1
q=1

for x=0 to 100
for y=0 to 100
for z=0 to 100
//e=mcSquared					// Just plain variable setting
//e=mcSquared+1+(1,2)			// variable with numbers
//e=mcSquared+q+(q,q)			// variable with additional variables
//e=mcSquared+Sin(1)+Sin(1,2)	// variable with Trig
//e=mcSquared+Rnd(1)+Rnd(1,2)	// variable with Random
//e=mcSquared+k(1)+k(1,2)		// variable with Arrays
next
next
CLS;LoadingBar x,"Trying","Twirl";Flip
next

ResetDraw;CLS;Print Mills()-s;Print k(1,3);Flip

We're back to testing with this bit of code again.
You can play along by uncommenting the various test lines.

If you test this on the current version of JSE (v.3gin) you should find that the "Just plain variable setting" test is more or less the same sort of speed as the "variable with additional variables" test.
But trying the "variable with Arrays" test will drop the speed fairly dramatically.
This is because arrays are slow!! (Let's call it about a 30% slower difference)

My version running locally is currently v.3gio, and I've actually done a TON of array speedups to the point where the "variable with Arrays" is now more like a 10% difference, which is a HUGE increase as far as how things run goes.
.. Unfortunately, for reasons I cannot quite fathom, whatever it is that I've done has made the unused comma in the "variable with additional variables" stick out like a sore thumb, and now THAT test is running about 40% slower than the "Just plain variable setting" test.

Now, it should be noted that the comma in that line is technically wrong, and that the line is actually an error.
But changing it from a comma to a plus makes everything fast again, so ..
Something, somewhere, is not running as smoothly in v.3gio as it did in v.3gin, and I don't know what it is that I've changed!!!
And it's likely best to figure out what that error is, now, rather than have it crop up as a bonus-bug later!

I've been wrecking my brain trying to find that, since yesterday, and I've still not discovered the error.

More work on that, today, then.

Gotta go faster!!

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