reject and delete from hash with block : reject « Hash « Ruby

1. Ruby
2. Hash
3. reject

reject and delete from hash with block

h = {:a=>1, :b=>2, :c=>3, :d=>"four"}
h.reject! {|k,v| v.is_a? String }  # => {:a=>1, :b=>2, :c=>3 }
h.delete_if {|k,v| k.to_s < 'b' }  # => {:b=>2, :c=>3 }
h.reject! {|k,v| k.to_s < 'b' }    # => nil: no change
h.delete_if {|k,v| k.to_s < 'b' }  # => {:b=>2, :c=>3 }: unchanged hash
h.reject {|k,v| true }             # => {}: h is unchanged

 

Related examples in the same category