Scala中的行继续符 [英] Line continuation character in Scala

问题描述

我想像这样拆分以下Scala代码行:

I want to split the following Scala code line like this:

ConditionParser.parseSingleCondition("field=*value1*").description 
  must equalTo("field should contain value1")

但是行继续符是哪个?

推荐答案

将其括在括号中:

(ConditionParser.parseSingleCondition("field=*value1*").description 
  must equalTo("field should contain value1"))

Scala没有换行符"-总是在以下情况下推断分号:

Scala does not have a "line continuation character" - it infers a semicolon always when:

• 表达式可以结束
• 以下(非空白)行不以可以启动语句的令牌开头
• 之前没有找到未关闭的(或[

• An expression can end
• The following (not whitespace) line begins not with a token that can start a statement
• There are no unclosed ( or [ found before

因此，要延迟"分号推断，可以将方法调用或点放在行尾，或将点放在下一行的开头:

Thus, to "delay" semicolon inference one can place a method call or the dot at the end of the line or place the dot at the beginning of the following line:

ConditionParser.
parseSingleCondition("field=*value1*").
description must equalTo("field should contain value1")

a +
b +
c

List(1,2,3)
  .map(_+1)

这篇关于Scala中的行继续符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！