class String
Public Instance Methods
palindrome?()
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# File lib/new_string.rb, line 16 def palindrome? string = self string.gsub!(/[^A-Za-z0-9]/, "") string.downcase! string == string.reverse end
valid_brackets?()
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# File lib/new_string.rb, line 2 def valid_brackets? stack = [] self.split('').each do |char| if char == '(' stack << char elsif char == ')' if stack.pop != '(' return false end end end stack.empty? end