From: Jack Dempsey <dabigdemp@...>
Date: 2002-01-06T18:22:25+09:00
Subject: [ruby-talk:30338] Re: OT: Re: Sorting a Hash by value of integer stored in the Hash

This is a multi-part message in MIME format.

------=_NextPart_000_000F_01C19669.5D231FC0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

also, try doing something like

h =3D Hash[*array]

not sure if i got the syntax correct, and nobu's to_hash is more =
elegant, but it was kinda cool to find out this worked as well when i =
asked this same question about 3 months ago

Jack



Hello,

Yohanes Santoso <ysantoso@jenny-gnome.dyndns.org> wrote:

> irb(main):011:0> myh =3D {"z"=3D>5,"x"=3D>3,"y"=3D>7}

> irb(main):012:0> myh.sort{|a,b| a[1] <=3D> b[1]}=20

> ary =3D [["x", 3], ["z", 5], ["y", 7]]

^^^^^^^

Is there any "automatic" way to create hash from ary (above). I

didn't find any. (I know hash =3D Hash[[1,2,3,4]], but I doesn't

work for this)

Don't you think that it is strange is hash.to_a produces ary

(above), but there is now way to create hash back from this ary.

I think we should define new method

class Hash

def Hash::new_from_array(*ary)

if ary.size =3D=3D 1 then ary =3D ary[0] end

hash =3D {}

ary.each do |i|

hash[i[0]] =3D i[1]

end

hash

end

end

Or something like this, but with achieving compatibility with

'old' style Hash[].

Michal

--=20

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=
=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-

Michal Rokos Czech Technical University, Prague

E-mail: m.rokos@sh.cvut.cz Jabber: majkl@jabber.cz, ICQ: 36118339

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=
=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-





------=_NextPart_000_000F_01C19669.5D231FC0
Content-Type: text/html;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 5.50.4207.2601" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff><FONT size=3D2>
<P><FONT face=3DArial>also, try doing something like</FONT></P>
<P><FONT face=3DArial>h =3D Hash[*array]</FONT></P>
<P><FONT face=3DArial>not sure if i got the syntax correct, and nobu's =
to_hash is=20
more elegant, but it was kinda cool to find out this worked as well when =
i asked=20
this same question about 3 months ago</FONT></P>
<P><FONT face=3DArial>Jack</FONT></P>
<P><FONT face=3DArial></FONT>&nbsp;</P>
<P>Hello,</P>
<P>Yohanes Santoso &lt;ysantoso@jenny-gnome.dyndns.org&gt; wrote:</P>
<P>&gt; irb(main):011:0&gt; myh =3D =
{"z"=3D&gt;5,"x"=3D&gt;3,"y"=3D&gt;7}</P>
<P>&gt; irb(main):012:0&gt; myh.sort{|a,b| a[1] &lt;=3D&gt; b[1]} </P>
<P>&gt; ary =3D [["x", 3], ["z", 5], ["y", 7]]</P>
<P>^^^^^^^</P>
<P>Is there any "automatic" way to create hash from ary (above). I</P>
<P>didn't find any. (I know hash =3D Hash[[1,2,3,4]], but I doesn't</P>
<P>work for this)</P>
<P>Don't you think that it is strange is hash.to_a produces ary</P>
<P>(above), but there is now way to create hash back from this ary.</P>
<P>I think we should define new method</P>
<P>class Hash</P>
<P>def Hash::new_from_array(*ary)</P>
<P>if ary.size =3D=3D 1 then ary =3D ary[0] end</P>
<P>hash =3D {}</P>
<P>ary.each do |i|</P>
<P>hash[i[0]] =3D i[1]</P>
<P>end</P>
<P>hash</P>
<P>end</P>
<P>end</P>
<P>Or something like this, but with achieving compatibility with</P>
<P>'old' style Hash[].</P>
<P>Michal</P>
<P>-- </P>
<P>-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D=
-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=
</P>
<P>Michal Rokos Czech Technical University, Prague</P>
<P>E-mail: m.rokos@sh.cvut.cz Jabber: majkl@jabber.cz, ICQ: 36118339</P>
<P>-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D=
-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=
</P>
<P>&nbsp;</P></FONT>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

------=_NextPart_000_000F_01C19669.5D231FC0--