const comparatorFn = (value, str) => {
    if (typeof value === 'string' && value.length) {
        return value.toLowerCase().includes(str.toLowerCase());
    }
    return false;
} 

const findObj = (str, arr) => {
    return arr.filter(obj => Object
        .values(obj)
        .some(value => comparatorFn(value, str)));
}

const arr = [
    {name: 'asd', surname: 'sss'},
    {name: 'asd', surname: 'sss'},
    {name: 'asd', surname: 'azaza'},
    {name: 'asd', surname: 'azaza222'},
    {name: 'AZAzazAasadasdasf', surname: '123123123'},
];

findObj('azaza', arr)

const finder = new Finder(compartor, source);
finder.find(str)