From: Robert Klemme <shortcutter@...>
Date: 2013-04-11T23:44:32+09:00
Subject: Re: confusion with Struct class

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On Thu, Apr 11, 2013 at 4:27 PM, Love U Ruby <lists@ruby-forum.com> wrote:

> Why does every time the has value getting changed,while the instance
> variables values are not getting changed?
>
>
> Customer = Struct.new(:name, :address, :zip)
> joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
>
> p joe.hash
> p joe.object_id
>
> #-93880937
> #8577648
>
> p joe.hash
> p joe.object_id
>
> #275982710
> #8577648
>
> p joe.hash
> p joe.object_id
>
> #767998854
> #8577648
>
>
What the heck are you doing?

irb(main):004:0> Customer = Struct.new(:name, :address, :zip)
=> Customer
irb(main):005:0> joe = Customer.new("Joe Smith", "123 Maple, Anytown NC",
12345)
=> #<struct Customer name="Joe Smith", address="123 Maple, Anytown NC",
zip=12345>
irb(main):006:0> 5.times { puts joe.hash }
1060632465
1060632465
1060632465
1060632465
1060632465
=> 5
irb(main):007:0> 5.times { puts Customer.new("Joe Smith", "123 Maple,
Anytown NC", 12345).hash }
1060632465
1060632465
1060632465
1060632465
1060632465
=> 5

robert


-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Thu, Apr 11, 2013 at 4:27 PM, Love U Ruby <span dir=3D"ltr">&lt;=
<a href=3D"mailto:lists@ruby-forum.com" target=3D"_blank">lists@ruby-forum.=
com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">Why does every time the has value getting changed,while th=
e instance<br>

variables values are not getting changed?<br>
<br>
<br>
Customer =3D Struct.new(:name, :address, :zip)<br>
joe =3D Customer.new(&quot;Joe Smith&quot;, &quot;123 Maple, Anytown NC&quo=
t;, 12345)<br>
<br>
p joe.hash<br>
p joe.object_id<br>
<br>
#-93880937<br>
#8577648<br>
<br>
p joe.hash<br>
p joe.object_id<br>
<br>
#275982710<br>
#8577648<br>
<br>
p joe.hash<br>
p joe.object_id<br>
<br>
#767998854<br>
#8577648<br><br></blockquote><div style><br></div><div style>What the heck =
are you doing?</div><div style><br></div><div>irb(main):004:0&gt; Customer =
=3D Struct.new(:name, :address, :zip)</div><div>=3D&gt; Customer</div><div>
irb(main):005:0&gt; joe =3D Customer.new(&quot;Joe Smith&quot;, &quot;123 M=
aple, Anytown NC&quot;, 12345)</div><div>=3D&gt; #&lt;struct Customer name=
=3D&quot;Joe Smith&quot;, address=3D&quot;123 Maple, Anytown NC&quot;, zip=
=3D12345&gt;</div>
<div>irb(main):006:0&gt; 5.times { puts joe.hash }</div><div>1060632465</di=
v><div>1060632465</div><div>1060632465</div><div>1060632465</div><div>10606=
32465</div><div>=3D&gt; 5</div><div>irb(main):007:0&gt; 5.times { puts Cust=
omer.new(&quot;Joe Smith&quot;, &quot;123 Maple, Anytown NC&quot;, 12345).h=
ash }</div>
<div>1060632465</div><div>1060632465</div><div>1060632465</div><div>1060632=
465</div><div>1060632465</div><div>=3D&gt; 5</div><div style>=A0</div></div=
>robert<br><br clear=3D"all"><div><br></div>-- <br>remember.guy do |as, oft=
en| as.you_can - without end<br>
<a href=3D"http://blog.rubybestpractices.com/">http://blog.rubybestpractice=
s.com/</a>
</div></div>

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