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Removes each element in self for which the block returns a truthy value; returns self:
a = [:foo, 'bar', 2, 'bat']
a.delete_if {|element| element.to_s.start_with?('b') } # => [:foo, 2]
Returns a new Enumerator if no block given:
a = [:foo, 'bar', 2]
a.delete_if # => #<Enumerator: [:foo, "bar", 2]:delete_if>
               static VALUE
rb_ary_delete_if(VALUE ary)
    RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
    return ary;

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