Deep equal check for objects

EJS Exercise - Deep equal.js

function deepEqual(a, b) {
    let keysA = Object.keys(a);
    let keysB = Object.keys(b);
    if (keysA.length !== keysB.length) {
        return false;
    }
    for (let i = 0, len = keysA.length; i < len; i++) {
        let key = keysA[i];
        if (typeof a[key] === 'object' && typeof b[key] === 'object') {
            return deepEqual(a[key], b[key]);
        } else {
            if (a[key] !== b[key]) {
                return false;
            }
        }
    }
    return true;
}

var objA = {
    name: 'Git Faf',
    skills: ['JS', "CS"]
};
var objB = {
    name: 'Git Faf',
    skills: ['JS', "CS"]
};
var objC = {
    name: 'Git Faf',
    skills: ['CS', "JS"]
};
var objD = {
    name: 'GitFaf',
    skills: ['JS', "CS"]
};

console.log(deepEqual(objA, objB)); // true
console.log(deepEqual(objA, objC)); // false
console.log(deepEqual(objA, objD)); // false