checkOff.js

const checkOff = function(target, pattern){

    return Object.keys(pattern).every(key => {
        const T = typeof(pattern[key]);
        return (target.hasOwnProperty(key) &&
            (pattern[key] === null ||
                (T === typeof(target[key]) &&
                    (Array.isArray(pattern[key])
                        ? Array.isArray(target[key])
                        : (T === 'object'
                            ? checkOff(target[key], pattern[key])
                            : true
                        ) 
                    )
                )
            )
        );
    });
};