本文深入探讨了Scala中匹配表达式的三大关键特性：表达式总是返回一个值、不会发生跳转到下一个情况、未匹配模式时抛出MatchError异常。详细解释了匹配表达式的结果始终为单位值'()'。
There are three differences to keep in mind：
First, match is an expression in Scala, i.e., it always results in a value.
Second, Scala’s alternative expressions never “fall through”into the next case.
Third, if none of the patterns match, an exception named MatchError is thrown.
The result of either case is the unit value‘()’, which is also, therefore, the result of the entire match expression.
First, match is an expression in Scala, i.e., it always results in a value.
Second, Scala’s alternative expressions never “fall through”into the next case.
Third, if none of the patterns match, an exception named MatchError is thrown.
The result of either case is the unit value‘()’, which is also, therefore, the result of the entire match expression.
扫一扫
538
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
