gleam/io

Types

GetLineError

Error value returned by get_line function

pub type GetLineError {
  Eof
  NoData
}

Constructors

```
Eof
```
```
NoData
```

Functions

debug

</>

pub fn debug(term: a) -> a

Prints a value to standard output using Erlang syntax.

The value is returned after being printed so it can be used in pipelines.

Example

> io.debug("Hi mum")
// -> <<"Hi mum">>
"Hi mum"

> io.debug(Ok(1))
// -> {ok, 1}
Ok(1)

> import list
> [1, 2]
> |> list.map(fn(x) { x + 1 })
> |> io.debug
> |> list.map(fn(x) { x * 2 })
// -> [2, 3]
[4, 6]

get_line

</>

pub external fn get_line(
  prompt: String,
) -> Result(String, GetLineError)

Reads a line from standard input with the given prompt.

Example

> io.get_line("Language: ")
// -> Language: <- gleam
Ok("gleam\n")

print

</>

pub fn print(string: String) -> Nil

Writes a string to standard output.

Example

> io.print("Hi mum")
// -> Hi mum
Nil

println

</>

pub fn println(string: String) -> Nil

Writes a string to standard output, appending a newline to the end.

Example

> io.println("Hi mum")
// -> Hi mum
Nil