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Returns a new Array whose elements are all those from self for which the block returns false or nil:
a = [:foo, 'bar', 2, 'bat']
a1 = a.reject {|element| element.to_s.start_with?('b') }
a1 # => [:foo, 2]
Returns a new Enumerator if no block given:
a = [:foo, 'bar', 2]
a.reject # => #<Enumerator: [:foo, "bar", 2]:reject>
 
               static VALUE
rb_ary_reject(VALUE ary)
{
    VALUE rejected_ary;

    RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
    rejected_ary = rb_ary_new();
    ary_reject(ary, rejected_ary);
    return rejected_ary;
}
            

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