Searching an array

ruby-talk
1

I have an array of classes source[]

I can sort it like this
source.sort! { |x,y| x.fname <=> y.fname }

If I print it out it is sorted by 'fname'.

Now I would like to search it for different fnames but can't find an example of how to do that.
Can someone tell me how?

thanks,
Ralph

2

source.find {|x| x.fname == "foo"}
source.select {|x| x.fname == "foo"}

HTH

robert

···

2005/10/25, Ralph Smith <ralph@lkjlkj.com>:

I have an array of classes source

I can sort it like this
source.sort! { |x,y| x.fname <=> y.fname }

If I print it out it is sorted by 'fname'.

Now I would like to search it for different fnames but can't find an example of how to do that.
Can someone tell me how?

3

Ralph Smith wrote:

I have an array of classes source

I can sort it like this
source.sort! { |x,y| x.fname <=> y.fname }

If I print it out it is sorted by 'fname'.

Now I would like to search it for different fnames but can't find an example of how to do that.
Can someone tell me how?

thanks,
Ralph

I like grep eg.

results = source.grep(/.txt/)

returns a list (array) of entries that contain '.txt'. (including things like fred.txt.bak)

Array mixes in (includes) the methods in Enumerable which is where much of this magic is hiding.

Bill

4

Ralph Smith wrote:

I have an array of classes source

I can sort it like this
source.sort! { |x,y| x.fname <=> y.fname }

If I print it out it is sorted by 'fname'.

Now I would like to search it for different fnames but can't find an
example of how to do that. Can someone tell me how?

thanks,
Ralph

I like grep eg.

results = source.grep(/.txt/)

returns a list (array) of entries that contain '.txt'. (including
things like fred.txt.bak)

Unlikely that it works in this case as Ralf seems to have instances of a custom class in the array. If you want to make grep work with that you'd need to either implement #to_str for this custom class (which I'd find inappropriate) or do this

condition = lambda {|x| x.fname == "foo"}
class<<condition
  alias ===
end
source.grep condition

:slight_smile:

Array mixes in (includes) the methods in Enumerable which is where
much of this magic is hiding.

Yes, among them #inj... Ok, I'll keep my mouth shut.

Kind regards

    robert

···

Bill Mustard <bill@jrl.org> wrote: