=>(scala)

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1Function<n>[A[,B,...],T]　　:a function that takes parameters of type A[,B...], and returns a value of type T.

2=>()　　:A function that returns Unit is also known as a procedure, normally a method that‘s called only for its side effect.

3f(param: => T)　　:it‘s a "by-name parameter", meaning that is evaluated every time it‘s used within the body of the function, and not before. Ordinary "by-value" parameters are evaluated before entry into the function/method.

5case x => y　　:separate the pattern (and optional guard) from the result expression

=> is syntactic sugar for creating instances of functions. Recall that every function in scala is an instance of a class.

val f: Function1[Int,String] = myInt => "my int: "+myInt.toString

val f2: Int => String = myInt => "my int v2: "+myInt.toString

f: (Int) => String = <function1>

=>(scala)

标签：instance   eating   func   tac   code   expr   lua   effect   exp   

原文地址：http://www.cnblogs.com/yumanman/p/7559085.html