Convert javascript dot notation object to nested object

Question

I\'m trying to build a function that would expand an object like :

{
    \'ab.cd.e\' : \'foo\',
    \'ab.cd.f\' : \'bar\',
    \'ab.g\' : \'foo2\'
}
<         


        

Answer 1

Derived from Esailija's answer, with fixes to support multiple top-level keys.

(function () {
    function parseDotNotation(str, val, obj) {
        var currentObj = obj,
            keys = str.split("."),
            i, l = Math.max(1, keys.length - 1),
            key;

        for (i = 0; i < l; ++i) {
            key = keys[i];
            currentObj[key] = currentObj[key] || {};
            currentObj = currentObj[key];
        }

        currentObj[keys[i]] = val;
        delete obj[str];
    }

    Object.expand = function (obj) {
        for (var key in obj) {
            if (key.indexOf(".") !== -1)
            {
                parseDotNotation(key, obj[key], obj);
            }            
        }
        return obj;
    };

})();

var obj = {
    "pizza": "that",
    "this.other": "that",
    "alphabets": [1, 2, 3, 4],
    "this.thing.that": "this"
}

Outputs:

{
    "pizza": "that",
    "alphabets": [
        1,
        2,
        3,
        4
    ],
    "this": {
        "other": "that",
        "thing": {
            "that": "this"
        }
    }
}

Fiddle