September 2013
Intermediate to advanced
548 pages
12h 25m
English
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Short-Circuit Boolean Expressions
Short-circuit boolean expressions are boolean expressions whose arguments are evaluated only when necessary.
There are two “short-circuit” boolean expressions.
-
Expr1orelseExpr2 -
This first evaluates
Expr1. IfExpr1evaluates totrue,Expr2is not evaluated. IfExpr1evaluates tofalse,Expr2is evaluated. -
Expr1andalsoExpr2 -
This first evaluates
Expr1. IfExpr1evaluates totrue,Expr2is evaluated. IfExpr1evaluates tofalse,Expr2is not evaluated.
Note: In the corresponding boolean expressions (A or B;
A and B), both the arguments are always evaluated,
even if the truth value of the expression can be determined by
evaluating only the first expression.
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