Skip to main content

Function: flatMap()

Returns an iterable containing the values of the iterables returned from applying fn to each value of iterable in iteration order.

Like Array.prototype.flatMap, but for iterables.

Example​

console.log(
  pipe(
    [`sloth`, `more sloth`, `even more sloth`],
    flatMap(string => [string, string.length]),
    reduce(toArray()),
  ),
)
//=> [ 'sloth', 5, 'more sloth', 10, 'even more sloth', 15 ]

flatMap(fn)​

flatMap<From, To>(fn): (iterable) => Iterable<To, any, any>

Returns an iterable containing the values of the iterables returned from applying fn to each value of iterable in iteration order.

Like Array.prototype.flatMap, but for iterables.

Type Parameters​

• From

• To

Parameters​

• fn

Returns​

Function

Parameters​

• iterable: Iterable<From, any, any>

Returns​

Iterable<To, any, any>

Example​

console.log(
  pipe(
    [`sloth`, `more sloth`, `even more sloth`],
    flatMap(string => [string, string.length]),
    reduce(toArray()),
  ),
)
//=> [ 'sloth', 5, 'more sloth', 10, 'even more sloth', 15 ]

Defined in​

transforms.d.ts:112

flatMap(fn, iterable)​

flatMap<From, To>(fn, iterable): Iterable<To, any, any>

Returns an iterable containing the values of the iterables returned from applying fn to each value of iterable in iteration order.

Like Array.prototype.flatMap, but for iterables.

Type Parameters​

• From

• To

Parameters​

• fn

• iterable: Iterable<From, any, any>

Returns​

Iterable<To, any, any>

Example​

console.log(
  pipe(
    [`sloth`, `more sloth`, `even more sloth`],
    flatMap(string => [string, string.length]),
    reduce(toArray()),
  ),
)
//=> [ 'sloth', 5, 'more sloth', 10, 'even more sloth', 15 ]

Defined in​

transforms.d.ts:115