Is it possible to start debugging when a watch expression matches certain value or values?

[Sebastián Balay]

Hi there, I'm debugging a long while loop and right now I put a breakpoint inside the while loop to check the variable values. But I'm not interested in those values during the whole loop, I just want to check that when one of those variables matches certain value. Is it possible to accomplish that using the watch expressions?.

I'll add a quick and simple example to try to make my point clear:

while (true) {

  var a = getValue('a');

  var b = getValue('b'); 

  var c = getValue('c');

  var d = getValue('d'); 

  doSomething(a, b, c, d); 

}

So, I only want the execution to stop when c === 3. Debugging the entire while loop and check the variable value until it is 3 takes a lot of time.

This code is in production, so I can not change it to do something like: 

if (c === 3) debugger

Thanks! 

[PhistucK]

Not through watch expressions, but using conditional breakpoints -

Set a breakpoint, right click on it and select "Edit breakpoint...". Type an expression (c === 3) and press Enter. It will break only when the expression is truthy.

☆PhistucK

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[Dave Watts]

You might as well set a breakpoint within an if statement, since this would result in the same behavior. Its a shame the Chrome team didn't implement a conditional watch break imo

On Friday, 8 April 2016 18:08:56 UTC+2, PhistucK wrote:

Not through watch expressions, but using conditional breakpoints -

Set a breakpoint, right click on it and select "Edit breakpoint...". Type an expression (c === 3) and press Enter. It will break only when the expression is truthy.

☆PhistucK

On Fri, Apr 8, 2016 at 4:53 PM, Sebastián Balay <sebasti...@wolox.com.ar> wrote:

Hi there, I'm debugging a long while loop and right now I put a breakpoint inside the while loop to check the variable values. But I'm not interested in those values during the whole loop, I just want to check that when one of those variables matches certain value. Is it possible to accomplish that using the watch expressions?.

I'll add a quick and simple example to try to make my point clear:

while (true) {

  var a = getValue('a');

  var b = getValue('b'); 

  var c = getValue('c');

  var d = getValue('d'); 

  doSomething(a, b, c, d); 

}

So, I only want the execution to stop when c === 3. Debugging the entire while loop and check the variable value until it is 3 takes a lot of time.

This code is in production, so I can not change it to do something like: 

if (c === 3) debugger

Thanks! 

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To unsubscribe from this group and stop receiving emails from it, send an email to google-chrome-developer-tools+unsub...@googlegroups.com.

[PhistucK]

Does adding a watch expression such as -

condition && (function() { debugger; }())

Work?

☆PhistucK

To view this discussion on the web visit https://groups.google.com/d/msgid/google-chrome-developer-tools/ae0c57b0-8380-4fa9-9278-0f3ed2cc248f%40googlegroups.com.

[Kayce Basques]

Cool idea, Phistuck!

[Kayce Basques]

Doesn't seem to be working though... I feel like we should be able to hack something together...

[Victor Combal-Weiss]

Solution is here: https://stackoverflow.com/questions/56582385/devtools-break-on-expression/56582386#56582386