Multiline Repl problem

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1

Hello, I started learning Elm, but I am stuck at doing multiline in elm-repl .

Test example:

> functionExamp a1 a2 = a1 ++ a2
<function> : appendable -> appendable -> appendable
"Joe" |> functionExamp "Hello "
"Hello joe" : String

Totally works. But if I try to do it multiline, I get an (unhelpful) error:

> functionExamp a1 a2 = a1 ++ a2
<function> : appendable -> appendable -> appendable
"Joe" \ 
 |> functionExamp "Hello "
 |
-- SYNTAX PROBLEM --------------------------------------------------------- REPL

I got stuck here:

5|   "joe" \ 
           ^
Whatever I am running into is confusing me a lot! Normally I can give fairly
specific hints, but something is really tripping me up this time.

.

Also maybe it helps to know what changed in 0.19.1:

  • More intuitive multiline declarations in REPL

I Hope somebody can hint me in the right direction.

2

Making it a function without argument helps

  1. Type x = and press enter
  2. Type "Joe" and press enter
  3. Type |> functionExamp "Hello " and press enter
  4. Press enter

final output

> functionExamp a1 a2 = a1 ++ a2
<function> : appendable -> appendable -> appendable
> x = 
|   "Joe"
|   |> functionExamp "Hello "
|   
"Hello Joe" : String
>
1 Like
3

Hi, thanks for your solution. Do you have a source for this info? I can’t find this in the documentation.

4

I noticed multiline worked like that repl for functions on https://guide.elm-lang.org/core_language.html I’m not sure it is documented

5

I would love to see an improvement in the multi-line repl usage in Elm.

When you have large chunks of code, you have to try copying and pasting it into the repl because the alternative is pressing the up-arrow ~1000 times.

If we could press the up-arrow and get the entire block of code that was just run, it’d be really awesome!

1 Like
6

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