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Re: Undottability

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Martin Honnen wrote on 24 mrt 2013 in comp.lang.javascript:

> Evertjan. wrote:
>> var a = {};
>>
>> a[''] = 9;
>> alert(a['']); // 9
>>
>> [chrome tested]
>>
>> This object property seems undottable,
>> as you cannot write it like:
>>
>> a.b = 1;
>> alert(a.b); // 1
>>
>> Strangerder js?
> 
> Well generally property names are strings and the "dot" notation only 
> works for those strings that are identifiers. So the general property 
> access notation is the "bracket" notation, not the "dot" notation.

Okay.

So they are always strings, even the empty string,
and a number is converted to a string first?

var a = {};

a['8'] = 2;
a[08] = 9;

alert(a['8']); // 9
alert(a[8]); // 9

a['08'] = 2;
alert(a[8]); // 9

a['8'] = 1;
alert(a[8]); // 1

alert(a.length); // undefined [not an array]


> But that is nothing new, is it? When PHP required a group of input 
> controls to be named 'foo[]' e.g.
>    <input type="radio" name="foo[]" ...>

Well, I don't speak php, 
why would it require that in this example?

> then you always needed the bracket notation in Javascript to access 
> them, as in
>    document.forms.formName.elements['foo[]'][0]

-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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Thread

Undottability "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2013-03-24 11:34 +0100
  Re: Undottability Martin Honnen <mahotrash@yahoo.de> - 2013-03-24 12:02 +0100
    Re: Undottability "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2013-03-24 19:50 +0100
      Re: Undottability Martin Honnen <mahotrash@yahoo.de> - 2013-03-26 11:59 +0100

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