Conditional operator
Ternary ?: is the
conditional operator. It works like an if-then-else statement but
can safely be embedded within other operations and
functions:
test_expr?if_true_expr:if_false_expr
If the test_expr is true, only
the if_true_expr is evaluated.
Otherwise, only the if_false_expr is
evaluated. Either way, the value of the evaluated expression
becomes the value of the entire expression.
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