Parse semvers, chapter levels, and hierarchy's of numbers separated by dots to a javascript float

parseDot.js

var _ = require('lodash');

var testNumbers = [
    '0',
    '0.1',
    '0.2',
    '1',
    '1.4',
    '1.9.4',
    '1.11.4',
    '1.10',
    '2.1',
    '2.34',
    '55',
    '43',
    '33.1',
    '2.22',
];

// Turn strings of dot separated numbers into decimal numbers
// the numbers conserve the hierarchical order expressed by the dots
// ASSUMPTION: individual numbers (between dots), do not exceed 1000
function parseDot(x) {
    return x.split('.')
    .map(function(y) {
        return parseInt(y, 10);
    })
    .reduce(function(accu, y, i) {
        return accu + (y/Math.pow(1000, i));
    }, 0);
}

console.log(_.sortBy(testNumbers, parseDot));