How to solve eval() in JavaScript?

Question

When I have tried to solve this problem, I don't understood. Plz anyone inform me about this problem.
var a = "1";
var b = "2*2";
console.log(eval(a+b));

Ans: 24

Answer 1

It stringed the 1 and 2 together and did 12 * 2 that is how you got the result.

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

Answer 2

a and b are string variables, so the "+" operator is redefined to the string concatenation operator:
eval(a+b) => eval("1"+"2*2") => 24