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一直从事气象预报、服务建模实践应用。注重气象物理场、实况场、地理信息、本体知识库、分布式气象内容管理系统建立。对Barnes客观分析, 小波,计算神经网络、信任传播、贝叶斯推理、专家系统、网络本体语言有一定体会。一直使用Java、Delphi、Prolog、SQL编程。

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scala 操作符=方法

2013-06-30 11:40:42| 分类： Scala | 标签： |举报 |字号大中小订阅

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scala> val s = "Hello, world!"
s: String = Hello, world!

scala> s indexOf 'o'             //中缀操作=s.indexOf('o')
res6: Int = 4

scala> s indexOf ('o', 5)
res7: Int = 8

scala> s toLowerCase      //后缀操作=s.toLowerCase()
res8: String = hello, world!
--------------------------------------------------------------------------------------------
Any method can be an operator
In Scala operators are not special language syntax: any method can
be an operator. What makes a method an operator is how you use it.
When you write “s.indexOf('o')”, indexOf is not an operator. But
when you write “s indexOf 'o'”, indexOf is an operator, because
you’re using it in operator notation.
--------------------------------------------------------------------------------------------
0 max 5     = 5
0 min 5      = 0
-2.7 abs      = 2.7
2.7 round   =3L
1.5 isInfinity =false
(1.0 / 0) isInfinity= true
4 to 6 = Range(4, 5, 6)
"bob" capitalize ="Bob"
"robert" drop 2 = "bert"

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