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neharkarvishal/groupedFibbo.js

Created May 21, 2020 14:32
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groupedFibbo.js
/**
* getNumberOfDigits.js
* tags: { JavaScript, Array, RxJS }
*/
const { interval } = Rx;
const { scan, pluck, groupBy } = RxOperators;
interval(1000).pipe(
scan(
({ secondLast, last }) => ({ secondLast: last, last: last + secondLast }),
{ secondLast: 0, last: 1 }
),
pluck("secondLast"),
groupBy(n => Math.floor(Math.log10(n)))
)
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