在Scala REPL中，如何丢弃部分编写的多行命令？

Question

On Unix Shell terminal, you can discard a typed command just by typing ctrl-c. Is there a way to discard a typed command on Scala REPL?

Answer 1

Ctrl-C still works but it would exit the Scala REPL, which is probably not what you prefer.

A couple of cases:

1. If you're in the middle of a single-line command, you can hit Up button then Down to an empty command line.
2. If you're in the middle of a multi-line command and the command is incomplete, you can simply hit return a couple of times to let the REPL interpret the consecutive blank lines as intention to start a new command. But, in case you worry about whatever you've typed might get executed, safest way would still be to hit Ctrl-C .

Answer 2

When you're writing an unfinished block you can enter two blank lines and the REPL will then skip your command and start a new one.

You may then still use up buttons to retrieve the lines you want to continue with in the new command.