hectorguo

/**
 * Run promise with a max number of concurrent tasks
 * @param {Number} limit 
 */
function promiseAllWithLimit(limit) {
    let count = 0;
    let queue = [];

    const run = (fn, resolve, reject, ...args) => {
        count++;

hectorguo

function throttle(fn, rate) {
    let oldTime;
    let timer;

    function helper(...args) {
        const now = Date.now();

        // first time: need to call fn once
        if(!oldTime || now - oldTime > rate) {

hectorguo

function debounce(fn, delay) {
    let timer;

    function helper(...args) {
        clearTimeout(timer);
        timer = setTimeout(() => {
            fn.apply(this, args); // keep the original context
        }, delay);
    }

hectorguo

// requestAnimationFrame Polyfill for IE9
(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
        window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] 
                                   || window[vendors[x]+'CancelRequestAnimationFrame'];
    }
 

hectorguo

/**
 * Get Local IP Address
 * 
 * @returns Promise Object
 *
 * getLocalIP().then((ipAddr) => {
 *    console.log(ipAddr); // 192.168.0.122
 * });
 */
function getLocalIP() {

hectorguo

/**
 * var big1 = new BigNum('234234234234234');
 * var big2 = new BigNum('234234234234234');
 * big1.multiplyBy(big2).toString();  // will output "54865676487297999188377566756" instead of 5.4865676487298e+28
 */

var BigNum = function(num) {
    if (typeof num === 'string') {
        this.parts = [];
        while (num.length) {