Could you explain the result of this expression in JS?

Question

Please explain the result of the following expression:
'b' + 'a' + + 'a' + 'a'

Result: 'baNaNa'

Answer 1

😂
'b' + 'a' == ba
++ 'a' == NaN
+ 'a' == a

=> baNaNa
😂

//should be like this

var a,b,c;
a = "b"+"a";
b = +"a";
c="a"

document.write(a+b+c)

Answer 2

the first b and a are strings so they concatenate to 'ba'. you have an empty space + a which gives NaN + your a string at the end.