This line "1234567890".contains(s) is brilliant!

I feel really silly now, this is great.

I don't get a single line XD

Don't be, I am 35 lines ahead :)

Great! Now I feel stupid, lol...

I like how minimalistic this looks. Very clever. Though it's not for other word combinations as stated below, it's still very clever! Nice going.

That method is okay for multiple instance of the same word but it makes a lot of sense that it's not for words containing each other and not for words with their reversals. Thanks for this reminder.

I love this solution :D

Nice one :)
As a little improvements :

• The "number > 99" test is done up to 5 times (one time for each predicate), it can be done outside the stream.
• I'm not of fan of Integer.paseInt(Integer.toString(number)), but I guess it's a compromise for readability to have all the predicates on strings.

I really like the simplistic clarity of this solution. Thanks!

Like this one so much!

It's a solution who most people don't understand.
short, yes. smart, yes. clever, yes. but not best practices.

Nice, short solution. :)

How does Stream.<Predicate>of() work? Is it casting the output of the method?