I don't understand this JavaScript code ! Please explain to me ! Anybody..

Question

how can the result be 75 ?

var a = 1;
var b = 2;
var c = "8";
var d = c + (a=b+1) - c;
alert(d);

Answer 1

Just remember this rule

"8"+1=81
"8"-1=7

"5"+2= 52
"5"-2= 3

yeah I also was confused with this..
But JavaScript works like this only...

Well u can assume like this
+ operator treats "8" as string
-operator treats "8" as int

JavaScript is weird & strange @Siregar

Answer 2

Here var c="8"
we have double quotes here & so 8 is treated as a string

Take a look at this :
int 8+int 1=9
string 8+int 1= 81

solution is
"8"+(a=b+1)="8"+3=83
83-"8"=75

I hope this helps @Siregar

Answer 3

var d = "8" + (a = 2+1) - "8" =>
"8" + 3 - "8" => (first we do the +)
83 (string + integer) - "8" =>
75

ok?

Answer 4

@Elias Papachristos & @Sri Lakshmi

so basically, "8" + 3 is two separate number, 8 and 3, not eighty three.. I get that.. but how can (8 and 3) - "8" = 75 ?

so (8 and 3) - "8" is same as 83-8 ?
It does not make sense to me.. amazing

Answer 5

really weird.. maybe I will found another weirdness in js..