Errors

FScript supports two broad error styles.

Result for expected failures

Use Result<T, E> when callers should recover intentionally.

type Result<T, E> =
  | { tag: 'ok', value: T }
  | { tag: 'error', error: E }

This is the preferred model for parsing, validation, and other ordinary failure cases.

throw for exceptional situations

fail = (message: String): Never => {
  throw { tag: 'fatal', message }
}

try/catch can recover from thrown values when needed.

Good rule of thumb

• use Result when failure is part of the domain
• use throw when continuing normally is not the expected path

Comparison to JavaScript

JavaScript code often uses exceptions for many ordinary failure modes. FScript nudges you toward typed data-first failure handling instead.