Ignore first number of elements from a publisher in Combine

Published by donnywals on

If you have a Combine publisher and you want to ignore the first n elements that are published by that publisher, you can use the dropFirst(_:) operator. This operator will swallow any values emitted until the threshold you specify is reached. For example, dropFirst(1) will ignore the first emitted value from a publisher:

[1, 2, 3].publisher
  .dropFirst(1)
  .sink(receiveValue: { value in 
    print(value) // 2 and 3 are printed
  })

For more information about dropFirst and several variations of drop like drop(while:) and drop(untilOutputFrom:) you can refer to Apple's documentation.


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Categories: Combine