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clearfunction seems to be a SpiderMonkey-shell-specific addition, not a generic JavaScript thing. It certainly doesn't appear in the ES5 spec § Function Properties of the Global Object. I tried this withnodeand got a "ReferenceError: clear is not defined". In Chrome's and Firefox's console, theclearfunction just clears the console, regardless of what arguments it is passed. Or perhaps the tool you used complied to a version of ECMAScript older than 5.1? \$\endgroup\$