Why result is 24, but isn't 5 ?

Question

https://code.sololearn.com/WP28JlJOpqtM/?ref=app

Answer 1

evaluation log of eval(a+b):
eval(a + b)
-> eval(1 + "2*2")
-> eval("1" + "2*2")
-> eval("12*2")
-> 12*2
-> 24

In JavaScript, integers will get automatically converted to strings if they share any + operators with strings.

Answer 2

Seb TheS thanx

Answer 3

Потому что b строка