Skip to main content

Function: uniqueByAsync()

Returns an async iterable containing the values of asyncIterable in iteration order, except values for which fn returns a value awaitable to the same value are deduplicated.

When values are deduplicated, the value earlier in iteration order wins.

Example​

console.log(
  await pipe(
    asAsync([`sloth`, `sleep`, `fast`, `slow`, `mean`]),
    uniqueByAsync(word => word.length),
    reduceAsync(toArray()),
  ),
)
//=> [ 'sloth', 'fast' ]

uniqueByAsync(fn)​

uniqueByAsync<Value>(fn): (asyncIterable) => AsyncIterable<Value, any, any>

Returns an async iterable containing the values of asyncIterable in iteration order, except values for which fn returns a value awaitable to the same value are deduplicated.

When values are deduplicated, the value earlier in iteration order wins.

Type Parameters​

• Value

Parameters​

• fn

Returns​

Function

Parameters​

• asyncIterable: AsyncIterable<Value, any, any>

Returns​

AsyncIterable<Value, any, any>

Example​

console.log(
  await pipe(
    asAsync([`sloth`, `sleep`, `fast`, `slow`, `mean`]),
    uniqueByAsync(word => word.length),
    reduceAsync(toArray()),
  ),
)
//=> [ 'sloth', 'fast' ]

Defined in​

filters.d.ts:359

uniqueByAsync(fn, asyncIterable)​

uniqueByAsync<Value>(fn, asyncIterable): AsyncIterable<Value, any, any>

Returns an async iterable containing the values of asyncIterable in iteration order, except values for which fn returns a value awaitable to the same value are deduplicated.

When values are deduplicated, the value earlier in iteration order wins.

Type Parameters​

• Value

Parameters​

• fn

• asyncIterable: AsyncIterable<Value, any, any>

Returns​

AsyncIterable<Value, any, any>

Example​

console.log(
  await pipe(
    asAsync([`sloth`, `sleep`, `fast`, `slow`, `mean`]),
    uniqueByAsync(word => word.length),
    reduceAsync(toArray()),
  ),
)
//=> [ 'sloth', 'fast' ]

Defined in​

filters.d.ts:362