From: Stefano Crocco <stefano.crocco@...>
Date: 2007-06-02T16:53:51+09:00
Subject: Re: Array index of first bigger number...

Alle sabato 2 giugno 2007, Josselin ha scritto:
> Is there a simple function (I solve it w a loop.. C-minded) to find the
> index of the first bigger element in an array
>
> limit mini is first_element ,  if item < last_element
> item =  -2.23
> anArray = [0.0, 2.0, 5.0, 10.0, 15.0, 25.0]      first_bigger_element =
> 0.0 index 0
>
> item = 2.85
> anArray = [0.0, 2.0, 5.0, 10.0, 15.0, 25.0]      first_bigger_element =
> 5.0  index 2
>
> item = 12.55
> anArray = [0.0, 2.0, 5.0, 10.0, 15.0, 25.0]      first_bigger_element =
> 15.0 index 4
>
> limit maxi is last_element ,  if item > last_element
> item = 36.59
> anArray = [0.0, 2.0, 5.0, 10.0, 15.0, 25.0]      first_bigger_element =
> 25.0 index 5
>
> can it be writtent in just one line or a loop is unavoidable ?
>
> thanks
>
> joss

You can do:

  anArray.index(anArray.find{|i| i > item})

anArray.find will return the first element of the array for which the block 
returns true, i.e the first element which is greater than item; then 
anArray.index will return the index of the item. (This returns nil if no 
element in the array is greater than item)

I hope this helps

Stefano