9 lines
564 B
Plaintext
9 lines
564 B
Plaintext
Unlike strongly typed languages, JavaScript does not enforce a return type on a function. This means that different paths through a function can return different types of values, which can be very confusing to the user and significantly harder to maintain.
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In particular a function, in JavaScript, will return ``++undefined++`` in any of the following cases:
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* It exits without a ``++return++`` statement.
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* It executes a ``++return++`` with no value.
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This rule verifies that return values are either always or never specified for each path through a function.
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