scala - 我将如何在Scala中表达一个链式的任务？

Question

我将如何在Scala中表达以下Java代码？

a = b = c;

顺便说一句，我要重新分配变量(不声明)。

Answer 1

只有在声明var或val时，才能使用Scala中最接近的快捷方式语法。

scala> val c = 1  
c: Int = 1

scala> val a, b = c
a: Int = 1
b: Int = 1

从Scala引用，第4.1节

A value declaration val x₁ , ... , x_n: T is a shorthand for the sequence of value declarations val x₁: T ; ...; val x_n: T. A value definition val p₁, ..., p_n = e is a shorthand for the sequence of value definitions val p₁ = e ; ...; val p_n = e . A value definition val p₁, ... , p_n : T = e is a shorthand for the sequence of value definitions val p₁ : T = e ; ...; val p_n: T = e .

这对于重新分配给var无效。 C/Java样式由于以下原因而无法使用:What is the Motivation for Scala Assignment Evaluating to Unit