Convert IP into Integer and Integer into IP

ip-num-conversion.js

import _ from 'lodash';

import {
  reduce
} from 'lodash';

const IP_CAL = [Math.pow(256, 3), Math.pow(256, 2), Math.pow(256, 1), Math.pow(256, 0)];

function ipToNum(ip) {
  return reduce(ip.split('.'), (ipnum, o, i) => (ipnum += (Number(o) * (IP_CAL[i]))), 0);
}

function numToIp(ipnum) {
  return reduce(IP_CAL, (o, d, i) => {
      o.push(Math.floor(ipnum / d) % 256);
      return o;
    }, [])
    .join('.');
}