Postfix operators are methods that take no arguments, when they are
invoked without a dot or parentheses.
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Basic Types and Operations identifiers that can be used as prefix
operators. You could invoke the method normally, as in p.unary_*, but if you attempted to invoke it via *p, Scala will
parse it as if you'd written *.p, which is probably not what you had in mind!
<span>Postfix operators are methods that take no arguments, when they are
invoked without a dot or parentheses. In Scala, you can leave off
empty parentheses on method calls. The convention is that you include
parentheses if the method has side effects, such as println(), but
you can leave them of
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