Break on a change of variable value

Question

Similar to other questions here, like this one.

Is there a way to break on the change of a variable value in any JavaScript debugger? (like IE Developer tools, Visua

Answer 1

You don't even need an IDE - you can use "Object.watch()":

Object.Watch Tutorial

If you use any one debugger, I'd strongly recommend Firebug. For all your Javascript, HTML and CSS needs :-):

http://getfirebug.com/javascript

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Update for 2019:

• Object.Watch is Ancient History. Uncoincidentally, it's unavailable in most contemporary browsers.

• My personal favorite JS debugging tool these days is Chrome Developer Tools.

• My personal favorite JS IDE (for Angular, .Net Core, etc) is Microsoft Visual Studio Code (MSVC).

• You can do just about any "expected" debugging operation - including set watches - with the Chrome debugger (just as you could with FF Firebug).

• Chrome debugger is well integrated with the MSVC IDE.

• Both are "free" (at least "free as in beer"); both run well on Windows, Mac and Linux.