See the code below:
2.toString(); // error
2..toString(); // "2"
2...toString(); // error
I want to know why 2..toString() can run without errors and what happens when it runs?
Can somebody explain it?
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Curious where you came accross this example code. It's somewhat suprising that it is essentially the same as from the example link provided in @Nikolay's answer...Zach Lysobey– Zach Lysobey2013-09-25 05:33:34 +00:00Commented Sep 25, 2013 at 5:33
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@Zach L I have seen it before some other place and I cannot understand it all the time.Today,I saw it again.So,I came here for the answer.It did surprise me when I opened the link provided by Nikolay,becasue I just saw another web site very similar to it.But it's another language not English.Joyce Lee– Joyce Lee2013-09-25 06:06:38 +00:00Commented Sep 25, 2013 at 6:06
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Possible duplicate of Calling member function of number literalgcampbell– gcampbell2016-10-14 18:58:48 +00:00Commented Oct 14, 2016 at 18:58
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1 Answer
http://shamansir.github.io/JavaScript-Garden/en/#object
A common misconception is that number literals cannot be used as objects. That is because a flaw in JavaScript's parser tries to parse the dot notation on a number as a floating point literal.
2.toString(); // raises SyntaxErrorThere are a couple of workarounds that can be used to make number literals act as objects too.
2..toString(); // the second point is correctly recognized 2 .toString(); // note the space left to the dot (2).toString(); // 2 is evaluated first
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Joyce Lee
@Nikolay Tlnv: Thanks.When the JavaScript's parser meets 2.toString(),it doesn't know how parse the dot as 2.|toString() or 2|.toString().If there is another dot or space left to the dot the parser can treat it as a certain way.Is it right?