Elm 0.17, shareable

Local REPL

The Elm Platform gives access to a REPL, on the command line. A REPL is a Read-Eval-Print Loop that let you experiment with simple expressions or check the functionality of imported libraries.

To start the REPL, type elm repl or elm-repl at the command line.

It is useful to explore the resulting value and type of simple expressions.

> 5 + 1
6 : number
> List.map
<function> : (a -> b) -> List a -> List b
> (++)
<function> : appendable -> appendable -> appendable

Any non core dependency must be imported first.

> import Dict -- Import required modules
> Dict.get
<function> : comparable -> Dict.Dict comparable a -> Maybe.Maybe a

Things to know.

Type :exit to exit.

You can spread your code over multiple lines with a backslash \ at the end of the line. Be sure not to have any whitespace after the backslash. A | will be added at the start of the line, to acknowledge that the next line is treated as a continuation of the current line.

> fn a b = \
|    a + b
<function> : number -> number -> number