The reason why that doesn't work is a legacy error in the ECMAScript standard. By following a numeral with a dot, the parser expects that you're defining a floating-point value, rather than an integer. You can still call methods on it, however, if you disambiguate by wrapping it in parentheses first. 
(5).foo();

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In reply to Re^4: I dislike object-oriented programming in general by pvande
in thread I dislike object-oriented programming in general by vrk

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