Accessing Deep Properties from Objects

access-deep-props.js

var obj = {
    x: {
        p: [
            {
                q: [
                    "Foo Bar"
                ]
            }
        ]
    }
};

/**
 * Returns value if it exists,
 * else returns default
*/
function getProp(obj, props, def) { 
    let o = obj;
    props.forEach(prop => {
        o = o[prop] ? o[prop] : def;
    });
    return o;
}

/**
 * Sets value even if it doesn't exists
*/
function setProp(obj, props, val) {
    let o = obj, i;
    for (i = 0; i < props.length - 1; i++) { 
        if (o[props[i]] != null) {
            o = o[props[i]];
            continue;
        }
        return;
    }
    o[props[i]] = val;
}

console.log("Metasyntactic Vars: ");
console.log("Others: ", getProp(obj, ["x", "p", 0, "q", 0], "NA"));
setProp(obj, ["x", "p", 0, "q", 1], "Mew Mau");
console.log("Mine ", getProp(obj, ["x", "p", 0, "q", 1], "NA"));

Actually, after writing the code, I found out about
Lodash Get