brackets problem

gistfile1.txt

'()[]{}'

'(((]))'

']('

processClosedBracket('()[]{}')
processOpenBracket('paren', ')[]{}')

const isOpening = (char) => {
    return char in ['(', '{', '[']
}

const isClosing = (char) => {
    return char in [')', '}', ']']
}

const isStringClosed = (str) => {
    if (str[0] in ['(', '{', '[']) {
        return processOpenBracket(str[0], str.slice(1))
    }
    return false
}

const closedVersions = {
    '(': ')',
    '[': ']',
    '{': '}',
}

'(((]))'
'(,)))'
'(,]))'
'],))'

'(])'

'(,])'
'],)'

const processOpenBracket = (type, string) => {
    if isOpening(string[0]) {
        return processOpenBracket(string[0], string.slice(1))
    }
    return closedVersions[type] === string[0]
}