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Function: findLast()

Returns an iterable containing the last value of iterable for which fn returns a truthy value. Otherwise, returns an empty iterable.

Example​

const iterable = [1, 2, `sloth`, 4, `other string`]

console.log(
  pipe(
    iterable,
    findLast(value => typeof value === `string`),
    or(() => `yawn!`),
  ),
)
//=> other string

console.log(
  pipe(
    iterable,
    findLast(value => Array.isArray(value)),
    or(() => `yawn!`),
  ),
)
//=> yawn!

findLast(fn)​

findLast<Value>(fn): (iterable) => Optional<Value>

Returns an iterable containing the last value of iterable for which fn returns a truthy value. Otherwise, returns an empty iterable.

Type Parameters​

• Value

Parameters​

• fn

Returns​

Function

Parameters​

• iterable: Iterable<Value, any, any>

Returns​

Optional<Value>

Example​

const iterable = [1, 2, `sloth`, 4, `other string`]

console.log(
  pipe(
    iterable,
    findLast(value => typeof value === `string`),
    or(() => `yawn!`),
  ),
)
//=> other string

console.log(
  pipe(
    iterable,
    findLast(value => Array.isArray(value)),
    or(() => `yawn!`),
  ),
)
//=> yawn!

Defined in​

filters.d.ts:628

findLast(fn, iterable)​

findLast<Value>(fn, iterable): Optional<Value>

Returns an iterable containing the last value of iterable for which fn returns a truthy value. Otherwise, returns an empty iterable.

Type Parameters​

• Value

Parameters​

• fn

• iterable: Iterable<Value, any, any>

Returns​

Optional<Value>

Example​

const iterable = [1, 2, `sloth`, 4, `other string`]

console.log(
  pipe(
    iterable,
    findLast(value => typeof value === `string`),
    or(() => `yawn!`),
  ),
)
//=> other string

console.log(
  pipe(
    iterable,
    findLast(value => Array.isArray(value)),
    or(() => `yawn!`),
  ),
)
//=> yawn!

Defined in​

filters.d.ts:628