Lines of commented-out code in files¶

ID: js/lines-of-commented-out-code-in-files
Kind: treemap
Severity: 
Precision: high
Tags:
   - maintainability

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This metric counts the number of lines of commented-out code in each file. Large amounts of commented-out code often indicate poorly maintained code.

Example¶

In the following example, a console.log method call, perhaps originally used for debugging, is left in the code, but commented out. It should be removed altogether.

function area(r) {
	// console.log("Got r: " + r);
	return r.length * r.width;
}

References¶

Mark Needham: The danger of commenting out code.
Los Techies: Commented Code == Technical Debt.
High Integrity C++ Coding Standard: 2.3.2 Do not comment out code.

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