What is the difference between a *= 1 and a = +a?

Question

What is the difference between

a *= 1;

and

a = +a;

in JavaScript?

Both convert a string to number (int or float). They behave differently from parseInt and parseFloat. But is there any difference between these two lines?

Answer 1

There isn't any difference. They are both converted to numbers using a ToNumber conversion. And the numerical multiplication by 1 and unary plus operation keep the values the same.