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Single Line Comments
Single line comments start with //.
Any text between // and the end of the line will be ignored by JavaScript (will not be executed).
Multi-line Comments
Multi-line comments start with /* and end with */.
Any text between /* and */ will be ignored by JavaScript.
Using Comments to Prevent Execution
Using comments to prevent execution of code is suitable for code testing.
Adding // in front of a code line changes the code lines from an executable line to a comment.
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