OC
OCaml Error Handling
OCaml error handling with Result, Option, and exceptions
Details
Language / Topic
OCamlCategory
Error Handling
Rules
balanced
- Use `result` type (`Ok value` / `Error e`) for expected failure cases — reserve exceptions for truly unexpected runtime failures.
- Use `let* x = result_val in ...` with `Result.bind` or the `let*` syntax from `ppx_let` to chain fallible operations.
- Define module-specific error types as variants: `type error = Not_found | Invalid_input of string | Timeout`.
- Use `Result.map`, `Result.map_error`, and `Result.fold` to transform values without unwrapping them in intermediate steps.