Removing "nil" entries from array

[Thomas Adam]

Dear All,

I have a really weird situation. I'm reading a file into an array, based
on a grep match. This works fine.....

...yet I re-ran my program using the same data file (unchanged) and now my
array is being intermittently populated with "nil" values. Using "uniq()"
doesn't remove them. Any ideas?

-- Thomas Adam

=====
Thomas Adam

"The Linux Weekend Mechanic" -- www.linuxgazette.com

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[Joey Gibson]

...yet I re-ran my program using the same data file (unchanged) and now my
array is being intermittently populated with "nil" values. Using "uniq()"
doesn't remove them. Any ideas?

What about using delete_if?

a = [:foo, nil, :bar, :baz, nil, nil, "testing"]
a.delete_if {|x| x == nil}
=> [:foo, :bar, :baz, "testing"]

delete_if modifies the array in place. If you want non-destuctive, use
"reject" instead.

 

[Michael Garriss]

Dear All,

I have a really weird situation. I'm reading a file into an array, based
on a grep match. This works fine.....

...yet I re-ran my program using the same data file (unchanged) and now my
array is being intermittently populated with "nil" values. Using "uniq()"
doesn't remove them. Any ideas?

[1, nil, 2, nil, 3, nil, 4].compact!
--> [1, 2, 3, 4]

....or you could use #compact if you don't want to change the array in
place.

Regards,
Michael

 

[Gavin Sinclair]

On 9/19/2003 9:54 AM, Thomas Adam wrote:

What about using delete_if?

a = [:foo, nil, :bar, :baz, nil, nil, "testing"]
a.delete_if {|x| x == nil}

=>> [:foo, :bar, :baz, "testing"]

delete_if modifies the array in place. If you want non-destuctive, use
"reject" instead.

Array#compact is designed for getting rid of nil values.

Gavin

 

[Jason Creighton]

Dear All,

I have a really weird situation. I'm reading a file into an array, based
on a grep match. This works fine.....

..yet I re-ran my program using the same data file (unchanged) and now my
array is being intermittently populated with "nil" values. Using "uniq()"
doesn't remove them. Any ideas?

Well, as several people have mentioned, you could use Array#compact, but
if I were you, I would try to find out why you're getting nil values.
Could you post the smallest possible code snippet + data that shows this
problem?

Jason Creighton