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From: Vitaliy Yanchuk on 20 Jul 2010 09:47
Hello, everyone.

Would be grateful if someone can tell, how can I do shortly (mb with one
method) from such example array

["a", "b", "a", "c", "c", "b", "b"]

The result
a => 2
b => 3
c => 2

So, to count number of occurances
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From: Jean-Julien Fleck on 20 Jul 2010 10:00
Hello,

> Would be grateful if someone can tell, how can I do shortly (mb with one
> method) from such example array
>
> ["a", "b", "a", "c", "c", "b", "b"]
>
> The result
> a => 2
> b => 3
> c => 2
>
> So, to count number of occurences

>> arr = ["a", "b", "a", "c", "c", "b", "b"]
=> ["a", "b", "a", "c", "c", "b", "b"]
>> h = Hash.new(0) ; arr.each {|e| h[e] += 1}; p h
{"a"=>2, "b"=>3, "c"=>2}
=> nil

Cheers,

--
JJ Fleck
PCSI1 Lycée Kléber

From: Vitaliy Yanchuk on 20 Jul 2010 10:25
Jean-Julien Fleck, thanks.
Maybe have an idea of a one-line version? :)

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From: Jean-Julien Fleck on 20 Jul 2010 10:44
2010/7/20 Vitaliy Yanchuk <fuksito(a)gmail.com>:
> Jean-Julien Fleck, thanks.
> Maybe have an idea of a one-line version? :)

Well: quite the same using inject:

arr.inject(Hash.new(0)) {|h,e| h[e]+= 1; h}

It all depends on what you call 'one-line' :o)

Cheers,

--
JJ Fleck
PCSI1 Lycée Kléber

From: Vitaliy Yanchuk on 20 Jul 2010 10:58
Jean-Julien Fleck wrote:
> 2010/7/20 Vitaliy Yanchuk <fuksito(a)gmail.com>:
>> Jean-Julien Fleck, thanks.
>> Maybe have an idea of a one-line version? :)
>
> Well: quite the same using inject:
>
> arr.inject(Hash.new(0)) {|h,e| h[e]+= 1; h}
>
> It all depends on what you call 'one-line' :o)
>
> Cheers,

Wow, Inject is cool method, thanks !
In my mind one-line is that dows not have semi-coloms or new lines of
course
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