Re: Testing for definition of references

if( defined $arrayref && 
    defined @$arrayref )
[download]

should do it, but

if( defined $arrayref && 
    ref( $arrayref ) eq 'ARRAY' )
[download]

looks better to me.

This will test if the array has elements:

if( @$arrayref )

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Re: Re: Testing for definition of references by DBX (Pilgrim) on Jun 26, 2003 at 18:09 UTC
Thanks, but I actually am trying to avoid using ref() if possible. Also, you are testing: `if(defined $arrayref)` [download] This is insufficient since $arrayref may be set to a scalar value and thus would return true. I don't want to test to see if $arrayref is simply defined, but if the array it references is defined. I use: `if(defined @$arrayref)` [download] as a means to distinguish the definition of an array reference from all other types of data. My question relates to whether this is valid test or not.	[reply] [d/l] [select]
Re: Re: Re: Testing for definition of references by Anonymous Monk on Jun 26, 2003 at 18:15 UTC
Why are you avoiding ref()?	[reply]
Re: Re: Re: Testing for definition of references by fglock (Vicar) on Jun 26, 2003 at 18:18 UTC
No, it's not. An empty array will return false!	[reply]