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let obj = {details: {address: {city: "Ness Ziona", street: "Saknai"}}};

console.log(obj);
console.log(obj.details);
console.log(obj.details.address);
console.log(obj.details.address.city);

let a = "details";
let b = "address.city";
let keys = `${a}.${b}`.split('.');
let root = obj;
const last = keys.reduce((key, root) => {
    console.log(root[key]);
    return root[key]}, root);

console.log(last);