Hello all,
Was just wondering if there was something simple like:
hash.clear("value")
This would remove all entries from the hash whose value == "value".
Yeah, I know about delete_if, this would just be more succinct. I can be
lazy sometimes.
thanks,
andy
--
Andrew Stone
You can always wrap delete_if...
class Hash
def remove(target)
self.delete_if { | key, value |
value == target
}
end
end
Regards,
Jordan
On Nov 28, 1:47 pm, Andrew Stone <stoneli...@gmail.com> wrote:
Note: parts of this message were removed by the gateway to make it a legal Usenet post.
Hello all,
Was just wondering if there was something simple like:
hash.clear("value")
This would remove all entries from the hash whose value == "value".
Yeah, I know about delete_if, this would just be more succinct. I can be
lazy sometimes.thanks,
andy--
Andrew Stone
Just a subtle point: IMHO it is better to put "target" on the left
side of the comparison because that gives the caller more control on
the deletion criterion:
class Hash
def remove(target)
delete_if { | key, value |
target == value
}
end
end
For example, you could do
crit = Object.new
def crit.==(x) x < 10 end
a_hash.remove crit # remove all entries where value is < 10
It's a similar pattern to how "case" does comparison via "===". But
then again, this is probably even better:
class Hash
def remove_val
delete_if {|k,v| yield v}
self
end
end
Because it's more modular. But then again, you can use delete_if directly. 
Kind regards
robert
2007/11/28, MonkeeSage <MonkeeSage@gmail.com>:
On Nov 28, 1:47 pm, Andrew Stone <stoneli...@gmail.com> wrote:
> Note: parts of this message were removed by the gateway to make it a legal Usenet post.
>
> Hello all,
>
> Was just wondering if there was something simple like:
>
> hash.clear("value")
>
> This would remove all entries from the hash whose value == "value".
>
> Yeah, I know about delete_if, this would just be more succinct. I can be
> lazy sometimes.
>
> thanks,
> andy
>
> --
> Andrew StoneYou can always wrap delete_if...
class Hash
def remove(target)
self.delete_if { | key, value |
value == target
}
end
end
--
use.inject do |as, often| as.you_can - without end
> > Note: parts of this message were removed by the gateway to make it a legal Usenet post.
> > Hello all,
> > Was just wondering if there was something simple like:
> > hash.clear("value")
> > This would remove all entries from the hash whose value == "value".
> > Yeah, I know about delete_if, this would just be more succinct. I can be
> > lazy sometimes.> > thanks,
> > andy> > --
> > Andrew Stone> You can always wrap delete_if...
> class Hash
> def remove(target)
> self.delete_if { | key, value |
> value == target
> }
> end
> endJust a subtle point: IMHO it is better to put "target" on the left
side of the comparison because that gives the caller more control on
the deletion criterion:class Hash
def remove(target)
delete_if { | key, value |
target == value
}
end
endFor example, you could do
crit = Object.new
def crit.==(x) x < 10 end
a_hash.remove crit # remove all entries where value is < 10
Nice.
It's a similar pattern to how "case" does comparison via "===". But
then again, this is probably even better:class Hash
def remove_val
delete_if {|k,v| yield v}
self
end
endBecause it's more modular. But then again, you can use delete_if directly.
Yes, but we're lazy! 
No blocks here! Heh. Otherwise we would just
use delete_if!
On Nov 29, 4:35 am, Robert Klemme <shortcut...@googlemail.com> wrote:
2007/11/28, MonkeeSage <MonkeeS...@gmail.com>:
> On Nov 28, 1:47 pm, Andrew Stone <stoneli...@gmail.com> wrote:
Kind regards
robert
--
use.inject do |as, often| as.you_can - without end
Laziness is exactly the reason why I use delete_if. Why? Because I
can be sure it's there. I don't have to create a lib of my personal
extensions, require it in every script and make sure it can be found
via RUBYLIB. Granted, setting RUBYLIB is a one time effort, but
requiring needs to be done for every script plus I cannot pass scripts
around as easily; I have to at least shop two files. etc.
Kind regards
robert
2007/11/30, MonkeeSage <MonkeeSage@gmail.com>:
On Nov 29, 4:35 am, Robert Klemme <shortcut...@googlemail.com> wrote:
> 2007/11/28, MonkeeSage <MonkeeS...@gmail.com>:
>
>
>
> > On Nov 28, 1:47 pm, Andrew Stone <stoneli...@gmail.com> wrote:
> > > Note: parts of this message were removed by the gateway to make it a legal Usenet post.
>
> > > Hello all,
>
> > > Was just wondering if there was something simple like:
>
> > > hash.clear("value")
>
> > > This would remove all entries from the hash whose value == "value".
>
> > > Yeah, I know about delete_if, this would just be more succinct. I can be
> > > lazy sometimes.
>
> > > thanks,
> > > andy
>
> > > --
> > > Andrew Stone
>
> > You can always wrap delete_if...
>
> > class Hash
> > def remove(target)
> > self.delete_if { | key, value |
> > value == target
> > }
> > end
> > end
>
> Just a subtle point: IMHO it is better to put "target" on the left
> side of the comparison because that gives the caller more control on
> the deletion criterion:
>
> class Hash
> def remove(target)
> delete_if { | key, value |
> target == value
> }
> end
> end
>
> For example, you could do
>
> crit = Object.new
> def crit.==(x) x < 10 end
> a_hash.remove crit # remove all entries where value is < 10Nice.
> It's a similar pattern to how "case" does comparison via "===". But
> then again, this is probably even better:
>
> class Hash
> def remove_val
> delete_if {|k,v| yield v}
> self
> end
> end
>
> Because it's more modular. But then again, you can use delete_if directly.Yes, but we're lazy!
use delete_if!
--
use.inject do |as, often| as.you_can - without end