Javascript - (10<3<10) return true

Question

Why does (10<3<10) return true in Javascript? 3<10 but 10<3 is false. So it should return false

Actually, the reason it should return false is because 10 cannot possibly `<3` being less than 10 because 10 *is not less than* 10. — BoltClock, Apr 11 '14 at 17:50
Most languages don't support the double comparison like that. — Sam G-H, Apr 11 '14 at 17:50
You can't really use two operators, so operator presedence kicks in, and it's read `( (10<3) < 10 )` which equals `( false < 10 )` which is true — adeneo, Apr 11 '14 at 17:50
This has been asked and answered here on SO at least once before, but I don't have the link handy. *Edit*: Oh, hey, it was right there in the "related" list. Which means it was on the "Your question may already have an answer" list shown to you before you posted the question. — T.J. Crowder, Apr 11 '14 at 17:52

score 11 · Accepted Answer · answered Apr 11 '14 at 17:49

11

10<3<10 is equivalent to (10<3)<10. 10<3 is false, false<10 is true.

answered Apr 11 '14 at 17:49

hobbs

Is `false` converted to `0` for the comparison? – Tim S. Apr 11 '14 at 17:51
Wow! I thought it is more mysterious))) – AlieN Apr 11 '14 at 17:53
otherwise, 10 converted to true... – vp_arth Apr 11 '14 at 17:53
@TimS.: Yes. The relational operators can act on strings or numbers, and prefer numbers. So if both sides support being converted to numbers (and bools do), it'll go with that. – T.J. Crowder Apr 11 '14 at 17:53
yup! Which is very strange for me, and PHP acts like that too. I like Ruby (which this kind of nonsense doesn't happen)! – Vitor Tyburski Apr 11 '14 at 17:53
there is not strong types) – vp_arth Apr 11 '14 at 17:55

score 2 · Answer 2 · answered Apr 11 '14 at 17:49

2

because

Number(false)

is 0 and 10<3 is false.

answered Apr 11 '14 at 17:49

kojiro

2 Answers2