reject() public

Returns an array for all elements of enum for which block is false (see also Enumerable#find_all). 

   (1..10).reject {|i|  i % 3 == 0 }   #=> [1, 2, 4, 5, 7, 8, 10]
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September 9, 2013
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Using reject to remove key/value pairs from a hash

Code example

# Remove empty strings
{ a: 'first', b: '', c: 'third' }.reject { |k,v| v.empty? } #=> {:a=>"first", :c=>"third"}

# Remove nil
{a: 'first', b: nil, c: 'third'}.reject { |k,v| v.nil? } # => {:a=>"first", :c=>"third"}

# Remove nil & empty strings
{a: '', b: nil, c: 'third'}.reject { |k,v| v.nil? || v.empty? } # => {:c=>"third"}