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pairwise operator

See original GitHub issue

Issue Description

Is have pairwise operator in wonka?

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:8 (4 by maintainers)

github_iconTop GitHub Comments

1reaction
sxd1140commented, Nov 25, 2019

I got it. Thanks a lot.

0reactions
kittencommented, Nov 25, 2019

You can just store the previous value using scan temporarily, then calculate your scroll trajectory separately:

  scan(
    ({ current: prev }, current) => ({ prev, current }),
    { current: null }
  ),
  map(({ prev, current }) => prev !== null ? current - prev : 0)
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