Function matchOption

Takes a (lazy) default value, a function, and an Option value, if the Option value is None the default value is returned, otherwise the function is applied to the value inside the Some and the result is returned.

Example

import { some, none, match } from 'fp-ts/Option'
import { pipe } from 'fp-ts/function'

assert.strictEqual(
  pipe(
    some(1),
    match(() => 'a none', a => `a some containing ${a}`)
  ),
  'a some containing 1'
)

assert.strictEqual(
  pipe(
    none,
    match(() => 'a none', a => `a some containing ${a}`)
  ),
  'a none'
)
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Since

2.10.0