Can I use chained comparison operator syntax?

Question

In one JS library I saw such syntax:

if (val > 5 == t) { ... }

I tested this in console:

1 == 1 == 2 // false
2 > 1 =         


        

Answer 1

It's a correct syntax but not one I would recommend. What's happening, is probably:

if ((val > 5) == t) { ... }

I tested this in console:

(1 == 1) == 2 // false
(2 > 1) == 1  // true
(1 == 2) == 1 // false
(1 == 1) == 1 // true
(1 < 2) < 3   // true
(1 > 2) > 3   // false

With the boolean on the left implicitly converted to an int.