map function for objects (instead of arrays)

Question

I have an object:

myObject = { \'a\': 1, \'b\': 2, \'c\': 3 }

I am looking for a native method, similar to Array.prototype.map

Answer 1

I needed a version that allowed modifying the keys as well (based on @Amberlamps and @yonatanmn answers);

var facts = [ // can be an object or array - see jsfiddle below
    {uuid:"asdfasdf",color:"red"},
    {uuid:"sdfgsdfg",color:"green"},
    {uuid:"dfghdfgh",color:"blue"}
];

var factObject = mapObject({}, facts, function(key, item) {
    return [item.uuid, {test:item.color, oldKey:key}];
});

function mapObject(empty, obj, mapFunc){
    return Object.keys(obj).reduce(function(newObj, key) {
        var kvPair = mapFunc(key, obj[key]);
        newObj[kvPair[0]] = kvPair[1];
        return newObj;
    }, empty);
}

factObject=

{
"asdfasdf": {"color":"red","oldKey":"0"},
"sdfgsdfg": {"color":"green","oldKey":"1"},
"dfghdfgh": {"color":"blue","oldKey":"2"}
}

Edit: slight change to pass in the starting object {}. Allows it to be [] (if the keys are integers)