Provides a fallback value when no patterns match.

When to use

Use to finalize a matcher with a fallback for unmatched input.

Details

This function ensures that a matcher always returns a valid result, even if no defined patterns match. It acts as a default case, similar to the default clause in a switch statement or the final else in an if-else chain.

Example (Providing a default value when no patterns match)

import { Match } from "effect"

// Create a matcher for string or number values
const match = Match.type<string | number>().pipe(
  // Match when the value is "a"
  Match.when("a", () => "ok"),
  // Fallback when no patterns match
  Match.orElse(() => "fallback")
)

console.log(match("a"))
// Output: "ok"

console.log(match("b"))
// Output: "fallback"