Module extend

extend-recursive.js

function recursiveExtend(dest, path) {

    if (typeof path === "string") {
        path = path.split(".");
    }

    function extend(path, curSegmentIndex, curDest) {
        if (curSegmentIndex === path.length) {
            return curDest;
        }

        var segment = path[curSegmentIndex];

        if (typeof curDest[segment] === "undefined") {
            curDest[segment] = {};
        } 

        return extend(path, curSegmentIndex + 1, curDest[segment]) 
    }

    return extend(path.slice(1), 0, dest);
}

extend-reduce.js

function extend(dest, path) {

    if (typeof path === "string") {
        path = path.split(".");
    }

    return path.slice(1).reduce(function(res, segment) {
       if (typeof res[segment] === "undefined") {
          res[segment] = {};
       }

       return res[segment];
    }, dest);
}