Ruby - groupings.txt

// check to see if ‘(’s, ‘{’s and ‘[’s are all closed in proper order.


def grpingCheck string
    
    answer, grpHsh, grpArr = [], {"(" => ")", "{" => "}", "[" =>"]" }, []

    string.chars.map { |char| if ["(", "{", "["].include? char  
           grpArr.push(char)
        else
            grpHsh.values_at(grpArr.pop)[0] == char ? answer << true : answer << false
        end
    }
    answer.include?(false) ? false : true
end


grpingCheck("[{()[])}]")
 => true

grpingCheck(“[[[[(((())))]]]]”)
 => true

grpingCheck(“[{{{{{{[[[[[[((((“)
 => false

grpingCheck(“[(])”)
 => false


// I create an array, and when an opening grouper( ‘(‘, ’{‘ or ’[‘ ) is seen, push it into the hash. When a closing grouper is seen, pop out the last element of that array and it should match (checked by comparing it against the key/value hash. if it does, push ‘true’ into the answer array, if it doesn’t, push false. if the answer array has any ‘false’s in it, then it doesn’t pass the test.