Eval function in js

Question

How does it actually work
var a="1";
var b="2*2";
console.log(eval(a+b));

Output 24
If a=3
Output 64
Plz explain how eval works in case of values in strings like above example...

Answer 1

Eval evaluates a JavaScript expression just like it would actually stand at this point.
eval(a+b) will be processed as
eval("1"+"2*2")
both strings are added now so it'd look like
eval("12*2")
now the string will be evaluated:
12*2 = 24
if a=3:
eval(3+"2*2") is equal to
eval("32*2") which results in
32*2 = 64

Answer 2

Thanks ! I was lost too 🤯😁

Answer 3

Thankyou

Answer 4

Good result