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a guest Jan 20th, 2019 51 Never
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  1. const modal$ = merge(
  2.     show$.pipe(mapTo(true)),
  3.     hide$.pipe(mapTo(false)),
  4.     toggle$.pipe(mapTo(null))
  5.   ).pipe(
  6.     startWith(false),
  7.     scan((acc, curr) => {
  8.       if (curr === null) {
  9.         return !acc;
  10.       } else {
  11.         return curr;
  12.       }
  13.     })
  14.   );
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