convert rxjs5 operators into rxjs6 - rxjs

Question

i have following code written in rxjs5 and it broke with rxjs6
can some one help me with write in rxjs 6
its failing mergemap receiving groupedObserable which does not have count method and along also filter method does not exist.
list [
{id: '1', type: 't1', name: 'f1', des:'d1', selected: true},
{id: '2', type: 't1', name: 'f2', des:'d2', selected: false},
{id: '3', type: 't1', name: 'f11', des:'d11', selected: false},
{id: '4', type: 't1', name: 'f22', des:'d22', selected: true},
]
Observable.from(list)
.filter(a => a.name != null)
.groupBy(i => i.type)
.mergeMap(list => {
let count = list.count;
let selectedCount = 0;
list.filter( f => f.selected).count.subscribe(c => selectedCount = c)
return count.map(count => {
{
key: list.key,
totalCount: count,
selected: selectedCount
}
}
}).reduce((x, y) => {
x.isValid = x.selectedCount > 0
return x;
}).subscribe(r => {
console.log(r + 'any item selected')
}
)
when i tried to write in rxjs6 only progress i was able to made till here
thanks in advance.
from(list)
.pipe(
filter( s=> s.name != null) ,
groupBy(i => i.type),
mergeMap( (value, index) => {
value.count // that's where it starts to fail
}
))

Answer 1

The equivalent rxjs6 code should be like this:
from(list)
.pipe(
filter(a => a.name != null),
groupBy(i => i.type),
mergeMap((p) => {
return p.pipe(
filter(f => f.selected),
count(),
mergeMap(c => {
return p.pipe(
count(),
map(totalCount => {
return {
key: p.key,
totalCount: totalCount,
selected: c
};
})
);
})
);
}),
reduce((x, y) => {
//please adjust your code here as i could not see isValid on x
x.isValid = x.selectedCount > 0;
return x;
})
).subscribe(r => {
console.log(r + 'any item selected')
}
)
Hope it gives an idea of how to proceed.