Conditional Expressions
To express choosing between two alternatives, Scala has a conditional expression if-else. It looks like a if-else in Java, but is used for expressions, not statements.Example:
def abs(x: Int) = if (x >= 0) x else -x
Here are reduction rules for conditional expressions (e1 and e2 are arbitrary expressions, b is boolean expression)
if (b) e1 else e2:
if (true) e1 else e2 --> e1
if (false) e1 else e2 --> e2
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