difference between numbers using or without using variable

Question

What\'s the difference between the following code?

var a = 1;
a.toString(); // outputs: \"1\"

But this throws an error:

1.t         


        

Answer 1

Try to Change the Syntax,

(1).toString()

Numbers can have decimals, so the syntax for ending in a decimal is a bit ambiguous when you go to parse the code, use parenthesis to be valid. It's a bit clearer when you see that this is also valid:

(1.).toString()

However with just

1.toString() it's trying to parse as a number with a decimal, and it fails.