Interface Nexus\Collection\Operation\FilterKeys

`<TKey, T>`

Nexus\Collection\Operation\FilterKeys
- Nexus\Collection\CollectionInterface extends Countable, IteratorAggregate<TKey, T>, All<TKey, T>, Any<TKey, T>, Append<TKey, T>, Associate<TKey, T>, Chunk<TKey, T>, Cycle<TKey, T>, Diff<TKey, T>, DiffKey<TKey, T>, Drop<TKey, T>, Every<TKey, T>, Filter<TKey, T>, FilterKeys<TKey, T>, FilterWithKey<TKey, T>, First<TKey, T>, Flip<TKey, T>, Forget<TKey, T>, Get<TKey, T>, Has<TKey, T>, Intersect<TKey, T>, IntersectKey<TKey, T>, Keys<TKey, T>, Limit<TKey, T>, Map<TKey, T>, MapKeys<TKey, T>, MapWithKey<TKey, T>, Partition<TKey, T>, Reduce<TKey, T>, Reductions<TKey, T>, Reject<TKey, T>, Slice<TKey, T>, Take<TKey, T>, Tap<TKey, T>, Values<TKey, T>
  - Nexus\Collection\Collection implements CollectionInterface<TKey, T>

Located at Nexus/Collection/Operation/FilterKeys.php

Methods
`public`	`filterKeys(null\|(Closure(TKey): bool) $predicate = null): CollectionInterface<TKey, T>` Returns a new collection from keys where `$predicate` returns `true`. If `$predicate` is not provided, this will just check for non-falsey keys. Returns a new collection from keys where `$predicate` returns `true`. If `$predicate` is not provided, this will just check for non-falsey keys. Implemented by `Nexus\Collection\Collection::filterKeys()`	#