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stevermeister/pairwise.rx.js

Created March 26, 2017 18:54
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pairwise.rx.js
// Tracking the scroll delta
Rx.Observable
.fromEvent(document, 'scroll')
.map(e => window.pageYOffset)
.pairwise()
.subscribe(pair => console.log(pair)); // pair[1] - pair[0]
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