what's the difference if a number with parenthesis or without parenthesis?

Question

the type of (8) and 8 are both numbers, but when called toString() method, (8) success but 8 failed, why?

when you cover a number with parenthesis then that would become an expression. — Rajaprabhu Aravindasamy, May 02 '16 at 12:29
give a space after 8 otherwise it will be treated as floating point — gurvinder372, May 02 '16 at 12:30

score 4 · Accepted Answer · edited May 02 '16 at 12:46

4

The difference between having 8 and (8) is, the former is a plain number and the latter is a JavaScript Expression. The problem with the Exception is, the way you have written:

8.toString(2);

Here, the 8. is treated as a floating point or decimal, which causes the syntax error. Since it takes it as a decimal, giving a decimal yields the right result:

» 8.0.toString(2);
« "1000"

edited May 02 '16 at 12:46

Bergi

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answered May 02 '16 at 12:31

Praveen Kumar Purushothaman

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`8` is an expression as well. – georg May 02 '16 at 12:32
@georg But it is treated as floating point. – Praveen Kumar Purushothaman May 02 '16 at 12:33

score 2 · Answer 2 · answered May 02 '16 at 12:35

8.toString() // Won't work

Here . is treated as a floating point number representation. So if you want to convert a non floating point number into string just give a space after the number

8 .toString(); // Will work

And if it a floating point number then you can call toString directly

8.2.toString(); // Will work even it doesn't have the space
8..toString(); // Will also work

But I would recommend you to use parenthesis for code readability.

And a number wrapped in parenthesis is an expression.

what's the difference if a number with parenthesis or without parenthesis?

2 Answers2