Scala Symbols

1. 箭头

<-

for循环中

for (arg <- args)

for (i <- 0 until 10)

->

val colors = Map("red" -> "#FF0000", "azure" -> "#F0FFFF")	定义Map的键值对映射
val t = "A" -> "B" //("A", "B")	直接生成Tuple（其实上面也是这个用法）

<=

没这玩意

=>

t: => Long	参数声明，传名调用
f: Int => String	参数声明，传函数
(x: Int) => x + 1	定义匿名函数
case 1 => "one"	模式匹配match-case中