Build objects tree from string with properties separating by dot.

builder.js

module.exports = {
    construct: _construct
};

function _construct(path) {
    var parts = path.split('.');
    var result = {};

    var last = parts.slice(0, parts.length - 1).reduce(function (prev, part) {
        prev[part] = {};
        return prev[part];
    }, result);

    last[parts.slice(-1).pop()] = path;

    return result;
}

tests.js

// dependencies
var assert = require('assert');
var builder = require('./builder');

// initialization
var built = builder.build('path.to.create');

assert.ok(built);
assert.ok(built.path);
assert.ok(built.path.to);

assert.equal(typeof built, 'object');
assert.equal(typeof built.path, 'object');
assert.equal(typeof built.path.to, 'object');
assert.equal(typeof built.path.to.create, 'string');

assert.equal(built.path.to.create, 'path.to.create');