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zven

2007-Mar-17 03:15 UTC

Enumerable.each and ''this'' confuse

When I use ''this'' keyword in Enumerable.each it always
references to
Enumerable. Is it ok? How to call ''hello'' method in loop using
Enumerable.each?

Foo = Class.create();
Foo.prototype = {
    initialize: function() {
        var array = $A([1, 2, 3]);
        array.each(function (i) {
            this.hello();
        });
    },

    hello: function() {
        alert(''hello'');
    }
}


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Gareth Evans

2007-Mar-17 03:55 UTC

head link

Re: Enumerable.each and ''this'' confuse

Just verified- I presume this is by design (so you can access the root
enumerable item per item iterating) but you can solve it like so

Foo = Class.create();
Foo.prototype = {
   var self = this;
   initialize: function() {
       var array = $A([1, 2, 3]);
       array.each(function (i) {
           self.hello();
       });
   },

   hello: function() {
       alert(''hello'');
   }
}




On 3/17/07, zven
<Alexander.Uvarov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
>
> When I use ''this'' keyword in Enumerable.each it always
references to
> Enumerable. Is it ok? How to call ''hello'' method in loop
using
> Enumerable.each?
>
> Foo = Class.create();
> Foo.prototype = {
>    initialize: function() {
>        var array = $A([1, 2, 3]);
>        array.each(function (i) {
>            this.hello();
>        });
>    },
>
>    hello: function() {
>        alert(''hello'');
>    }
> }
>
>
> >
>
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Gareth Evans

2007-Mar-17 03:58 UTC

head link

Re: Enumerable.each and ''this'' confuse

Sorry i put the definition for self in the wrong place

 Foo = Class.create();
Foo.prototype = {
   initialize: function() {
       var self = this;
       var array = $A([1, 2, 3]);
       array.each(function (i) {
           self.hello();
       });
   },

   hello: function() {
       alert(''hello'');
   }
}





On 3/17/07, Gareth Evans <agrath-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
> Just verified- I presume this is by design (so you can access the root
> enumerable item per item iterating) but you can solve it like so
>
> Foo = Class.create();
> Foo.prototype = {
>    var self = this;
>    initialize: function() {
>        var array = $A([1, 2, 3]);
>        array.each(function (i) {
>            self.hello();
>        });
>    },
>
>    hello: function() {
>        alert(''hello'');
>    }
> }
>
>
>
>
>  On 3/17/07, zven
<Alexander.Uvarov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> >
> > When I use ''this'' keyword in Enumerable.each it
always references to
> > Enumerable. Is it ok? How to call ''hello'' method in
loop using
> > Enumerable.each?
> >
> > Foo = Class.create();
> > Foo.prototype = {
> >    initialize: function() {
> >        var array = $A([1, 2, 3]);
> >        array.each(function (i) {
> >            this.hello();
> >        });
> >    },
> >
> >    hello: function() {
> >        alert(''hello'');
> >    }
> > }
> >
> >
> > > >
> >
>
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zven

2007-Mar-17 04:02 UTC

head link

Re: Enumerable.each and ''this'' confuse

Thx, Gareth. I already found solution. Other possible solution is:
with(this) { ... }

On Mar 17, 8:58 am, "Gareth Evans"
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Sorry i put the definition for self in the wrong place
>
>  Foo = Class.create();
> Foo.prototype = {
>    initialize: function() {
>        var self = this;
>        var array = $A([1, 2, 3]);
>        array.each(function (i) {
>            self.hello();
>        });
>    },
>
>    hello: function() {
>        alert(''hello'');
>    }
>
> }
>
> On 3/17/07, Gareth Evans
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>

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Gareth Evans

2007-Mar-17 04:20 UTC

head link

Re: Enumerable.each and ''this'' confuse

For my, and other group members benefit, could you please paste your final
solution?
I do not know what you mean by with(this) so I want to see in case it is a
better solution for the problem if I have it in the future.

Gareth


On 3/17/07, zven
<Alexander.Uvarov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
>
> Thx, Gareth. I already found solution. Other possible solution is:
> with(this) { ... }
>
> On Mar 17, 8:58 am, "Gareth Evans"
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Sorry i put the definition for self in the wrong place
> >
> >  Foo = Class.create();
> > Foo.prototype = {
> >    initialize: function() {
> >        var self = this;
> >        var array = $A([1, 2, 3]);
> >        array.each(function (i) {
> >            self.hello();
> >        });
> >    },
> >
> >    hello: function() {
> >        alert(''hello'');
> >    }
> >
> > }
> >
> > On 3/17/07, Gareth Evans
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
>
>
> >
>
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zven

2007-Mar-17 04:34 UTC

head link

Re: Enumerable.each and ''this'' confuse

Foo = Class.create();
Foo.prototype = {
    initialize: function() {
        var array = $A([1, 2, 3]);
        with(this) {
          array.each(function (i) {
              hello();
          });
        }
    },

    hello: function() {
        alert(''hello'');
    }

On Mar 17, 9:20 am, "Gareth Evans"
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> For my, and other group members benefit, could you please paste your final
> solution?
> I do not know what you mean by with(this) so I want to see in case it is a
> better solution for the problem if I have it in the future.

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Colin Mollenhour

2007-Mar-17 05:13 UTC

head link

Re: Enumerable.each and ''this'' confuse

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html;charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
<pre wrap="">Foo = Class.create();
Foo.prototype = {
    initialize: function() {
        var array = $A([1, 2, 3]);
        array.each(function (i) {
              this.hello();
        }.bind(this));
    },
    hello: function() {
        alert(''hello'');
    }
};
</pre>
Gareth Evans wrote:
<blockquote
 cite="mid:46944cba0703162120v112218faqf4f0b70eb074bde2-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org"
 type="cite">
  <div>For my, and other group members benefit, could you please paste
your final solution?</div>
  <div>I do not know what you mean by with(this) so I want to see in
case it is a better solution for the problem if I have it in the
future.</div>
  <div>&nbsp;</div>
  <div>Gareth<br>
  <br>
&nbsp;</div>
  <div><span class="gmail_quote">On 3/17/07, <b
 class="gmail_sendername">zven</b> &lt;<a
moz-do-not-send="true"
 href="mailto:Alexander.Uvarov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org">Alexander.Uvarov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org</a>&gt;
wrote:</span>
  <blockquote class="gmail_quote"
 style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px
0.8ex; padding-left: 1ex;"><br>
Thx, Gareth. I already found solution. Other possible solution is:<br>
with(this) { ... }<br>
    <br>
On Mar 17, 8:58 am, "Gareth Evans" &lt;
    <a moz-do-not-send="true"
href="mailto:agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org">agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org</a>&gt;
wrote:<br>
&gt; Sorry i put the definition for self in the wrong place<br>
&gt;<br>
&gt;&nbsp;&nbsp;Foo = Class.create();<br>
&gt; Foo.prototype = {<br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;initialize: function() {
    <br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var
self = this;<br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var
array = $A([1, 2, 3]);<br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;array.each(function
(i) {<br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.hello();<br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;});<br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;},<br>
&gt;<br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;hello: function() {<br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;alert(''hello'');<br>
&gt;&nbsp;&nbsp;&nbsp;&nbsp;}<br>
&gt;<br>
&gt; }<br>
&gt;<br>
&gt; On 3/17/07, Gareth Evans &lt;<a moz-do-not-send="true"
 href="mailto:agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org">agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org</a>&gt;
wrote:<br>
&gt;<br>
    <br>
    <br>
    <br>
    <br>
  </blockquote>
  </div>
</blockquote>
<br>
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</body>
</html>

<br>

Gareth Evans

2007-Mar-17 05:18 UTC

head link

Re: Enumerable.each and ''this'' confuse

Thanks Colin, I knew there was a bind solution as I hear people talking
about it but I hadn''t specifically looked for a solution.

Gareth


On 3/17/07, Colin Mollenhour
<eliteii92g-NPSFNn/7+NYVo650/ln6uw@public.gmane.org>
wrote:>
> Foo = Class.create();Foo.prototype = {
>     initialize: function() {
>         var array = $A([1, 2, 3]);
>         array.each(function (i) {
>               this.hello();
>         }.bind(this));
>     },
>     hello: function() {
>         alert(''hello'');
>     }
> };
>
> Gareth Evans wrote:
>
> For my, and other group members benefit, could you please paste your final
> solution?
> I do not know what you mean by with(this) so I want to see in case it is a
> better solution for the problem if I have it in the future.
>
> Gareth
>
>
> On 3/17/07, zven
<Alexander.Uvarov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> >
> > Thx, Gareth. I already found solution. Other possible solution is:
> > with(this) { ... }
> >
> > On Mar 17, 8:58 am, "Gareth Evans" <
agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > Sorry i put the definition for self in the wrong place
> > >
> > >  Foo = Class.create();
> > > Foo.prototype = {
> > >    initialize: function() {
> > >        var self = this;
> > >        var array = $A([1, 2, 3]);
> > >        array.each(function (i) {
> > >            self.hello();
> > >        });
> > >    },
> > >
> > >    hello: function() {
> > >        alert(''hello'');
> > >    }
> > >
> > > }
> > >
> > > On 3/17/07, Gareth Evans
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > >
> >
> >
> >
> >
> >
> >
>
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Rails spinoffs - Mar 2007 - Enumerable.each and 'this' confuse

Enumerable.each and ''this'' confuse

Re: Enumerable.each and ''this'' confuse

Re: Enumerable.each and ''this'' confuse

Re: Enumerable.each and ''this'' confuse

Re: Enumerable.each and ''this'' confuse

Re: Enumerable.each and ''this'' confuse

Re: Enumerable.each and ''this'' confuse

Re: Enumerable.each and ''this'' confuse