effect-io-ai

Package: effect
Module: Option

Option.match

Pattern-matches on an Option, handling both None and Some cases.

When to use

Use when you need to handle both Some and None in one expression and transform an Option into a plain value.

Details

• If None, calls onNone and returns its result
• If Some, calls onSome with the value and returns its result
• Supports the dual API (data-last and data-first)

Example (Matching on an Option)

import { Option } from "effect"

const message = Option.match(Option.some(1), {
  onNone: () => "Option is empty",
  onSome: (value) => `Option has a value: ${value}`
})

console.log(message)
// Output: "Option has a value: 1"

See

• getOrElse for unwrapping with a default

Signature

declare const match: { <B, A, C = B>(options: { readonly onNone: LazyArg<B>; readonly onSome: (a: A) => C; }): (self: Option<A>) => B | C; <A, B, C = B>(self: Option<A>, options: { readonly onNone: LazyArg<B>; readonly onSome: (a: A) => C; }): B | C; }

Source

Since v2.0.0