Ruby on Rails: Array : Nil item

@array = [ 1, nil, 3, nil, 5 ]

Remove nil item

@array.compact    #=> [ 1, 3, 5 ]

Count total of nil item

@array.length    #=> 5
@array.nitems    #=> 3
total_nil = @array.length - @array.nitems

Check the present of nil item

@array.include?nil    #=> true

Location of the nil item

@array.index(nil)    #=> 1

Refer site: http://ruby-doc.org/core/classes/Array.html


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