Ick1 result1 = potentiallyNull1();
Ick2 result2 = (result1 == null) ? null : potentiallyNull2(result1);
Ick3 result3 = (result2 == null) ? null : potentiallyNull3(result2);
Ick3 result3 = potentiallyNone1()
.flatMap(potentiallyNone2)
.flatMap(potentiallyNone3);
E.g. if I rebase some stacked branches then I want to undo it, with git I would reset each branch separately.
With jj you can timetravel the state of the repo in ine command