calls `f` for each element in the Sequence.

Unlike `for_each` this returns itself
allowing easier composition with
other Sequence features.

example:

[1,2,3,4,5]
  .filter is_prime
  .peek say
  .drop_while <10

1
2
3
4
[1,2,3,4,5]
  .filter is_prime
  .peek say
  .drop_while <10
 
 
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What are effects?

0.095dev (2025-08-15 12:02:22 GIT hash 301b5b75e77076d091b38f555473f9f0e31e5b5c built by fridi@fzen)

peek

Sequence.peek