无法使用：粘贴在Scala 3.0.0 repl中

发布于 2025-01-27 04:13:58 字数 679 浏览 2 评论 0原文

在Scala 2.x中，我使用：粘贴用于多行粘贴。我正在使用Scala 3.0.0，并且使用相同的方法会引发错误：

scala> :paste
Unknown command: ":paste", run ":help" for a list of commands

我尝试了以下内容，但是写完代码后我不知道该如何执行：

scala> if (true)
     |   println("that was true")
     | else
     |   print("false")
     |

我在

：粘贴未实施，但也不是真的需要，因为 Scala 3 repl。
支持多行粘贴。

如何在Scala 3中执行多行代码？

更新1：

我通过使用

scala> if (true)
     |   println("that was true")
     | else
     |   print("false")
     | ;
that was true

是否有其他方法来执行多行代码，而无需编写;？

原文

In Scala 2.x I use :paste for multi-line pasting. I am using Scala 3.0.0 and using the same approach throws an error:

scala> :paste
Unknown command: ":paste", run ":help" for a list of commands

I tried the following but I don't know how to execute when I'm done writing the code:

scala> if (true)
     |   println("that was true")
     | else
     |   print("false")
     |

I found at https://users.scala-lang.org/t/solved-cannot-use-paste-in-scala3-repl/7587 that

:paste is not implemented but it’s also not really needed because
multi-line pasting is supported by the scala 3 REPL.

How do I execute the multi-line code in Scala 3?

UPDATE 1:

I achieved it by using

scala> if (true)
     |   println("that was true")
     | else
     |   print("false")
     | ;
that was true

Is there another way to execute the multi-line code, without having to write ;?

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青瓷清茶倾城歌 2025-02-03 04:13:58

我完成编写代码
时不知道该如何执行

为您的特定情况编写代码后如何执行，只需在repper中再次按 Enter ：

scala> if (true)
     |  println("that was true")
     | else
     |  print("false")
     | // <-- press enter here again
that was true

repl中的块

您还可以输入由卷曲括号界定的块（即， {和}）。块派上用场，可以在卧室中实现密封特征。

让我们尝试定义对象a和b扩展了密封特征lats：

scala> sealed trait Level
// defined trait Level
                                                                                      
scala> object A extends Level
-- [E112] Syntax Error: --------------------------------------------------------
1 |object A extends Level
  |       ^
  |       Cannot extend sealed trait Level in a different source file
  |
  | longer explanation available when compiling with `-explain`
1 error found

depp将latver 和a，就好像它们位于不同的文件中一样。如果将它们分组在一个块中，情况并非如此：

scala> {
     | sealed trait Level
     | object A extends Level
     | object B extends Level
     | }
// defined trait Level
// defined object A
// defined object B

I don't know how to execute when I'm done writing the code

For your particular case, just press Enter again in the REPL:

scala> if (true)
     |  println("that was true")
     | else
     |  print("false")
     | // <-- press enter here again
that was true

Blocks in the REPL

You can also enter a block delimited by curly braces (i.e., { and }) in the REPL. Blocks come in handy for implementing sealed traits in the REPL.

Let's try to define the objects A and B that extend the sealed trait Level:

scala> sealed trait Level
// defined trait Level
                                                                                      
scala> object A extends Level
-- [E112] Syntax Error: --------------------------------------------------------
1 |object A extends Level
  |       ^
  |       Cannot extend sealed trait Level in a different source file
  |
  | longer explanation available when compiling with `-explain`
1 error found

The REPL treats the definitions of Level and A as if they were located in different files. That isn't the case if you group them inside a block:

scala> {
     | sealed trait Level
     | object A extends Level
     | object B extends Level
     | }
// defined trait Level
// defined object A
// defined object B

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