[groovy-user] grep vs findAll

[Wujek Srujek]

Hi. I am having some trouble finding any relevant difference between grep and findAll - it looks like grep is a more specific case, where the argument has its isCase method called for each instance in a collection, which can always be done with findAll as well. I can imagine that for example this:

list.grep(~/blah/)

is faster than

list.findAll { it ==~ /blah/ }

as it compiles the pattern only once (I suppose?), but otherwise I see no real difference.

Are there any conventions as to when you one and when the other? Or is any of these deprecated?

wujek

[Dinko Srkoc]

On 22 December 2011 11:52, Wujek Srujek <wujek....@googlemail.com> wrote:
> Hi. I am having some trouble finding any relevant difference between grep
> and findAll - it looks like grep is a more specific case, where the argument
> has its isCase method called for each instance in a collection, which can
> always be done with findAll as well. I can imagine that for example this:
> list.grep(~/blah/)
> is faster than
> list.findAll { it ==~ /blah/ }
> as it compiles the pattern only once (I suppose?), but otherwise I see no
> real difference.

Looking at the source, I'm not convinced `grep` is faster than
`findAll`. It has to go through MetaClass to invoke `isCase` on a
filter. There is no such step in `findAll`.

> Are there any conventions as to when you one and when the other? Or is any
> of these deprecated?

Personally, I use `findAll`, but, honestly, never gave it much thought.

Cheers,
Dinko

>
> wujek

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