Operator - ALL

Observable.all(predicate)

Determines whether all elements of an observable sequence satisfy a condition.

Example:

res = source.all(lambda value: value.length > 3)

Keyword Arguments:
	predicate (bool) – A function to test each element for a condition.
Returns:	An observable sequence containing a single element determining whether all elements in the source sequence pass the test in the specified predicate.
Return type:	Observable

Ex-1
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   Observable.just(1,2,3,4,15).all(x -> x<10).subscribe(System.out::println);

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 Ex-2
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List<Integer> list2 = new ArrayList<>();
        list2.add(1);
        list2.add(2);
        list2.add(7);
        list2.add(8);
        list2.add(8);
        list2.add(9);
        list2.add(10);
        list2.add(3);
        list2.add(11);
        list2.add(4);
        list2.add(5);
        list2.add(5);
        list2.add(6);
        list2.add(11);
        list2.add(12);

Observable.fromIterable(list2).all(x -> x<50).subscribe(System.out::println);

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