objectMap(): Kind of Array.map() but for objects...

objectMap.js

// USAGE: objectMap(<object>, <callback>)
//        <object>: Any regular JavaScript object.
//        <callback>: function(<current_value>, <current_key>, <original_object>) {...}
// EXAMPLE:
//        objectMap({a: null, b: "23"}, Number) //-> { a: 0, b: 23 }
function objectMap(obj, cbk) {
    return Object.fromEntries(
        Object.entries(obj).map(
            ([key, value])=>[key, cbk(value, key, obj)]
        )
    );
};