RosettaCodeData/Task/Balanced-brackets/Sidef/balanced-brackets.sidef

func balanced (str) {

    var depth = 0
    str.each { |c|
           if(c=='['){ ++depth }
        elsif(c==']'){ --depth < 0 && return false }
    }

    return !depth
}

for str [']','[','[[]','][]','[[]]','[[]]]][][]]','x[ y [ [] z ]][ 1 ][]abcd'] {
    printf("%sbalanced\t: %s\n", balanced(str) ? "" : "NOT ", str)
}