In javascript, is an empty string always false as a boolean?

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Yes. Javascript is a dialect of ECMAScript, and ECMAScript language specification clearly defines this behavior:

ToBoolean

The result is false if the argument is the empty String (its length is zero);
otherwise the result is true

Quote taken from http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf

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