From: Intransition <transfire@...>
Date: 2012-06-25T23:59:13+09:00
Subject: Re: Enumerable#unassociate

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On Monday, June 25, 2012 2:38:48 AM UTC-4, Robert Klemme wrote:

> What's the use case for this? 
>

In my case it's supplemental to another method I am working on. I have no 
name for it yet, so call it #h.

  # Convert an Enumerable object to a Hash.
  #
  #   [:a, 1, :b, 2].h
  #   #=> {:a=>1, :b=>2}
  #
  #   [:a, 1, :b, 2, :a, 3].h{ |v0,v1| v0.to_i + v1 }
  #   #=> {:a=>4, :b=>2}
  #
  def h(init={})
    h = init

    if block_given?
      each_slice(2) do |k,v|
        h[k] = yield h[k], v
      end
    else
      each_slice(2){ |k,v| h[k] = v }
    end

    h
  end

The #unassociate method qould be of use as a preparation for using h, since 
this doesn't work with associative arrays (like whats returned by 
Hash#to_a).

  [[:a,1], [:b,2], [:a,3]].unassociate.h{ |v0, v1| v0 << v1 }
  #=> {:a=>[1,3], :b=>2}



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On Monday, June 25, 2012 2:38:48 AM UTC-4, Robert Klemme wrote:<div><blockq=
uote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;border-lef=
t: 1px #ccc solid;padding-left: 1ex;">What's the use case for this?
<br></blockquote><div><br></div><div>In my case it's supplemental to anothe=
r method I am working on. I have no name for it yet, so call it #h.</div><d=
iv><br></div><div><div>&nbsp; # Convert an Enumerable object to a Hash.</di=
v><div>&nbsp; #</div><div>&nbsp; # &nbsp; [:a, 1, :b, 2].h</div><div>&nbsp;=
 # &nbsp; #=3D&gt; {:a=3D&gt;1, :b=3D&gt;2}</div><div>&nbsp; #</div><div>&n=
bsp; # &nbsp; [:a, 1, :b, 2, :a, 3].h{ |v0,v1| v0.to_i + v1 }</div><div>&nb=
sp; # &nbsp; #=3D&gt; {:a=3D&gt;4, :b=3D&gt;2}</div><div>&nbsp; #</div><div=
>&nbsp; def h(init=3D{})</div><div>&nbsp; &nbsp; h =3D init</div><div><br><=
/div><div>&nbsp; &nbsp; if block_given?</div><div>&nbsp; &nbsp; &nbsp; each=
_slice(2) do |k,v|</div><div>&nbsp; &nbsp; &nbsp; &nbsp; h[k] =3D yield h[k=
], v</div><div>&nbsp; &nbsp; &nbsp; end</div><div>&nbsp; &nbsp; else</div><=
div>&nbsp; &nbsp; &nbsp; each_slice(2){ |k,v| h[k] =3D v }</div><div>&nbsp;=
 &nbsp; end</div><div><br></div><div>&nbsp; &nbsp; h</div><div>&nbsp; end</=
div><div><br></div></div><div>The #unassociate method qould be of use as a =
preparation for using h, since this doesn't work with associative arrays (l=
ike whats returned by Hash#to_a).</div><div><br></div><div>&nbsp;&nbsp;[[:a=
,1], [:b,2], [:a,3]].unassociate.h{ |v0, v1| v0 &lt;&lt; v1 }</div><div>&nb=
sp; #=3D&gt; {:a=3D&gt;[1,3], :b=3D&gt;2}<br></div><div><br></div><div><br>=
</div></div>
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