An Error Handling library for Gleam. Inspired by https://github.com/lpil/snag but with your own error type.
Problem gives you:
- An error stack that makes it easier to track the path of an error.
- Use your error type (instead of
String).
gleam add problemimport gleam/function
import problem.{type Outcome}
fn run_program(email) {
case signup(email) {
Error(problem) -> {
problem
|> problem.pretty_print(function.identity)
|> echo
}
Ok(user) -> {
todo
}
}
}
fn signup(email: String) -> Outcome(User, String) {
use valid_email <- result.try(
validate_email(email)
|> problem.context("in signup")
)
todo
}
fn validate_email(email: String) -> Outcome(String, String) {
Error("Invalid email")
|> problem.outcome
|> problem.context("in validate_email")
}run_program("invalid email")
Invalid email
stack:
in validate_email
in signup