What is the Closure Compiler?,
Steps to follow to validate the JS code:
1. Open the above URL in the browser
3. Click on the Compile button
4. Formated Compiled code / Warnings/ Errors can see in the right side pane.
5. Want to see the output format in different ways use the Pretty print and Print input delimiter
6. To optimize the code, use Optimization section and see the difference in the output.
Below is the screen shot for your reference.
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Have a nice day 🙂