Also, the &&
bit is an example of short-circuit logical expression evaluation,
which is a fairly standard feature of most languages. Since "false AND anything" is always False, the right-hand side of the expression won't be evaluated at all if the left-hand side is determined to be false. (It, so to speak, instead "takes the short circuit.") The programmer is using this to avoid referencing a property of something that is in a hash if that thing isn't
in the hash, thus avoiding a runtime error.
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