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From: Simbolla Simbolla on 17 Apr 2010 13:30
Hi all,

Below is my code

h={}
arr=[]
def gethash
h[1]=0
return h
end
arr[0]=gethash
puts arr[0].each {|k,v| puts "key #{k} value #{v}"}

For the above i get error saying "Undifined local variable or method 'h'
for main:Object(NameError)"

may i know reason for this error?
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From: David A. Black on 17 Apr 2010 14:26
Hi --

On Sun, 18 Apr 2010, Simbolla Simbolla wrote:

> Hi all,
>
> Below is my code
>
> h={}
> arr=[]
> def gethash
> h[1]=0
> return h
> end
> arr[0]=gethash
> puts arr[0].each {|k,v| puts "key #{k} value #{v}"}
>
> For the above i get error saying "Undifined local variable or method 'h'
> for main:Object(NameError)"
>
> may i know reason for this error?

The def keyword starts a new local scope. The same happens with class:

a = 1
class C
puts a # new local scope, so a is not defined
end


David

--
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THE Ruby training with Black/Brown/McAnally
COMPLEAT Coming to Chicago area, June 18-19, 2010!
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From: Phrogz on 17 Apr 2010 21:53
On Apr 17, 11:30 am, Simbolla Simbolla <vinod...(a)gmail.com> wrote:
> h={}
> arr=[]
> def gethash
>   h[1]=0
>   return h
> end
> arr[0]=gethash
> puts arr[0].each {|k,v| puts "key #{k} value #{v}"}
>
> For the above i get error saying "Undifined local variable or method 'h'
> for main:Object(NameError)"

If you want h to be a global variable, accessible everywhere, prefix
it with a dollar sign:

$h={}
def foo
$h[1]=0
$h
end
foo
p $h
#=> {1=>0}
From: Brian Candler on 18 Apr 2010 04:59
Gavin Kistner wrote:
> On Apr 17, 11:30�am, Simbolla Simbolla <vinod...(a)gmail.com> wrote:
>> for main:Object(NameError)"
> If you want h to be a global variable, accessible everywhere, prefix
> it with a dollar sign:
>
> $h={}
> def foo
> $h[1]=0
> $h
> end
> foo
> p $h
> #=> {1=>0}

But usually it would be better instead to:

(1) pass h as an argument to method foo; or
(2) define a class with instance variable @h

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