Why output is 24?

Question

Why 24?
https://code.sololearn.com/W1JpED5JYYbk/?ref=app

Answer 1

a+b => "12*2"
evaluating gives 24

Answer 2

I'm surprised it is not 42 which is the answer to everything. JK.

Answer 3

Swap to Spanish

because both are string and are concatenated, this is what it does (a + b), and then they are multiplied as values ​​when using eval ()

a = "1"

b = "2 * 2"

eval (a + b) = eval ("1" + "2 * 2") = eval ("12 * 2") = 24

Answer 4

To get a+b=5, btw, do:

console.log(eval(a)+eval(b));
//or
console.log(eval(a+"+"+b));

Answer 5

"1" + "2" * "2" = '12' * '2' = 24

Answer 6

you need to add parenthesis to 2 * 2 because it is a variable

Answer 7

"1"+"2*2" = "12*2" = 24