Plz explain

Question

Var str=“abc”;
Var arr =[1,2,3];
str.length =2;
are.length=2;
Console.log(str.length +arr.length);
Why answer is 5 not 6

Answer 1

In javascript string are immutable so str.length=2 dont have any effect
But array is mutable when you change its length it will change
So because str is immutable its length stay at 3
And array length now is 2
3+2=5

Answer 2

thank you so much u explained so well