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Function: uniqueBy()

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

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

Example​

console.log(
  pipe(
    [`sloth`, `sleep`, `fast`, `slow`, `mean`],
    uniqueBy(word => word.length),
    reduce(toArray()),
  ),
)
//=> [ 'sloth', 'fast' ]

uniqueBy(fn)​

uniqueBy<Value>(fn): (iterable) => Iterable<Value, any, any>

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

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

Type Parameters​

• Value

Parameters​

• fn

Returns​

Function

Parameters​

• iterable: Iterable<Value, any, any>

Returns​

Iterable<Value, any, any>

Example​

console.log(
  pipe(
    [`sloth`, `sleep`, `fast`, `slow`, `mean`],
    uniqueBy(word => word.length),
    reduce(toArray()),
  ),
)
//=> [ 'sloth', 'fast' ]

Defined in​

filters.d.ts:328

uniqueBy(fn, iterable)​

uniqueBy<Value>(fn, iterable): Iterable<Value, any, any>

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

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

Type Parameters​

• Value

Parameters​

• fn

• iterable: Iterable<Value, any, any>

Returns​

Iterable<Value, any, any>

Example​

console.log(
  pipe(
    [`sloth`, `sleep`, `fast`, `slow`, `mean`],
    uniqueBy(word => word.length),
    reduce(toArray()),
  ),
)
//=> [ 'sloth', 'fast' ]

Defined in​

filters.d.ts:331