This is a very interesting screencast if you'd like to learn to debug JavaScript using DTrace.
DTrace can examine JavaScript code execution in realtime, allowing you to identify performance issues and bugs. By using DTrace for JavaScript debugging, all sofware layers in the system can be examined from the same tool, such as the software of the browser and the kernel. For example, DTrace may help you prove that a performance issue is actually a bug in the browser - and not your JavaScript code.
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