Prev: Problem with Ruby Multithreading
Next: meaning of %w
From: Srijayanth Sridhar on 1 Jul 2008 04:13
Hello,

Is there any design reason for select returning an array and reject
returning a hash? Why this disparity?

Thank you,

Jayanth

From: Dave Bass on 1 Jul 2008 06:39
Srijayanth Sridhar wrote:
> Is there any design reason for select returning an array and reject
> returning a hash? Why this disparity?

In module Enumerable, both select and reject return an array (according
to the Pickaxe).
--
Posted via http://www.ruby-forum.com/.

From: Srijayanth Sridhar on 1 Jul 2008 06:46
irb(main):001:0> a=Hash.new
=> {}
irb(main):002:0> a[1]=2
=> 2
irb(main):003:0> a[2]=2
=> 2
irb(main):004:0> a[3]=4
=> 4
irb(main):005:0> a.select { |key,value| value > 2 }
=> [[3, 4]]
irb(main):006:0> a.reject { |key,value| value <= 2 }
=> {3=>4}


On Tue, Jul 1, 2008 at 4:09 PM, Dave Bass <davebass(a)musician.org> wrote:
> Srijayanth Sridhar wrote:
>> Is there any design reason for select returning an array and reject
>> returning a hash? Why this disparity?
>
> In module Enumerable, both select and reject return an array (according
> to the Pickaxe).
> --
> Posted via http://www.ruby-forum.com/.
>
>

From: Peña, Botp on 1 Jul 2008 06:58
From: Srijayanth Sridhar [mailto:srijayanth(a)gmail.com]
# irb(main):001:0> a=Hash.new
# => {}
# irb(main):002:0> a[1]=2
# => 2
# irb(main):003:0> a[2]=2
# => 2
# irb(main):004:0> a[3]=4
# => 4
# irb(main):005:0> a.select { |key,value| value > 2 }
# => [[3, 4]]
# irb(main):006:0> a.reject { |key,value| value <= 2 }
# => {3=>4}

that will change in newer version of ruby, eg ruby1.9

irb(main):015:0> RUBY_VERSION
=> "1.9.0"
irb(main):016:0> a=Hash.new
=> {}
irb(main):017:0> a[1]=2
=> 2
irb(main):018:0> a[2]=2
=> 2
irb(main):019:0> a[3]=4
=> 4
irb(main):020:0> a.select { |key,value| value > 2 }
=> {3=>4}
irb(main):021:0> a.reject { |key,value| value <= 2 }
=> {3=>4}

kind regards -botp

From: Srijayanth Sridhar on 1 Jul 2008 08:14
>
> that will change in newer version of ruby, eg ruby1.9
>
> irb(main):015:0> RUBY_VERSION
> => "1.9.0"
> irb(main):016:0> a=Hash.new
> => {}
> irb(main):017:0> a[1]=2
> => 2
> irb(main):018:0> a[2]=2
> => 2
> irb(main):019:0> a[3]=4
> => 4
> irb(main):020:0> a.select { |key,value| value > 2 }
> => {3=>4}
> irb(main):021:0> a.reject { |key,value| value <= 2 }
> => {3=>4}
>
> kind regards -botp
>
>

Thanks.

So this is just some sort of artefact/legacy code that never got changed?

Jayanth

 |  Next  |  Last
Pages: 1 2 3 4
Prev: Problem with Ruby Multithreading
Next: meaning of %w