Javascript logical operators and results

Question

I know that the result of logical operations in most of the languages is either true, false or 1,0. In Javascript I tried the following:

alert(6||5)  // => re         


        

Answer 1

Since javascript is not a typed languaged any object can be used on logical operators, if this object is null, a false boolean, an empty string, a 0 or an undefined variable then it acts like a false if it's anything else then it is like a true

At the end of the logical operation the last checked value returns.

So

6||2

Check first value -> "6"
6 = true
Go to next value -> "2"
2 = true

End of operation, return last value. 2 which would work the same as true if passed to another logical operation.

Edit: that was a wrong statement. 6||2 returns 6 because 6 acting as true is enough to know the condition OR is true without the need to check the next value.

It is really the same way as in

true||true

Check first value -> "true"
Check next value -> "true"
return last value -> "true"

And for 6 && 0 && 2

First value 6 = true
Next value 0 = false

Stop operation here and returns the last checked value: 0.

The | operator is a whole different thing, it simply peforms a logical OR on the bits of the input values, as explaned on the other answer by akp.