key value paths for javascript

getKeyValue.js

function getKeyValue(object, path, default_value){
    "use strict"
    if (typeof object === 'undefined') {
        return default_value;
    }
    
    let prop_cont_pair = path.split('.');
    let prop = prop_cont_pair[0];
    let cont = prop_cont_pair.slice(1).join('.');
    
    if (cont === '') {
        let oprop = object[prop];
        if (typeof oprop === 'undefined') {
            return default_value;
        } else if ((typeof oprop === "object") && (typeof default_value === "object")) {
            let result = default_value;
            for (var x in oprop) result[x] = oprop[x];
            return result;
        } else {
            return object[prop]
        };
    } else {
        return getKeyValue(object[prop], cont, default_value)
    };
};