Risyandi

// Set initial countdown time to 60 seconds
var countdown = 60;

// Update the timer display every second
setInterval(function() {
  countdown--;
  var seconds = countdown % 60;
  var minutes = Math.floor(countdown / 60);
  
  // Add leading zero to seconds if less than 10

Risyandi

function dateDiff(startDate, endDate) {
    console.log(new Date(startDate), "startDate"); // since user register
    console.log(new Date(endDate), "endDate"); // date of voucher expired

    const diffInMs = new Date(endDate) - new Date(startDate);
    const diffInDays = diffInMs / (1000 * 60 * 60 * 24);
    console.log(diffInDays, "diffInDays");

    if (diffInDays === 5) {
        console.log("voucher disappear");

Risyandi

/** step by step
* 1. Get time that passed since Unix Epoch using Date() constructor with getTime(),
* 2. calculate the difference between current date and future date,
* 3. convert milliseconds to seconds, minutes, hours, etc.
* 4. calculate remaining time using modulo (%) operations and rounding the result using Math.floor() to get approximate result.
**/

const now = new Date().getTime(); // current date
const futureDate = new Date('27 Jan 2030 16:40:00').getTime(); // setup time left

Risyandi

const now = new Date().getTime(); // current date
const futureDate = new Date('7 Feb 2023 16:40:00').getTime(); // setup time left

const timeleft = futureDate - now;

const days    = Math.floor( timeleft / (1000 * 60 * 60 * 24));
const hours   = Math.floor((timeleft % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
const minutes = Math.floor((timeleft % (1000 * 60 * 60)) / (1000 * 60));
const seconds = Math.floor((timeleft % (1000 * 60)) / 1000);

Risyandi

function stockPicker(arr) {
    // console.log(arr, "log risyandi: data array");
    let maxProfit = -1;
    for (let index = 0; index < arr.length; index++) {
        for (let jindex = index + 1; jindex < arr.length; jindex++) {
            let profit = arr[jindex] - arr[index]
            console.log(profit, "log risyandi: profit");
            if (profit > maxProfit) {
                maxProfit = profit
                // console.log(maxProfit, "log risyandi: maxProfit");

Risyandi

let string = "A man, a plan, a canal: Panama";

function palindromeTwo(alphabet) {
 alphabet = alphabet.replace(/[^a-z0-9]/gi, "").toLowerCase();
 let reverse = alphabet.split("").reverse().join("");
 return alphabet === reverse;
}

palindromeTwo(string);

Risyandi

function cekFunction(value) {
    let length = value.split(" ").length;
    let dimension = "";
    if (length <= 2) {
        dimension = value.split(" ").length > 1 ? value.split(" ")[0] : "";
    } else {
        dimension = value.split(" ").length > 1 ? value.split(" ")[1] : "";
    }
    let dimensionValue = dimension.split("x").length > 1 ? dimension.split("x") : [];
    let volume = dimensionValue.length > 1 ? parseFloat(dimensionValue[0]) * parseFloat(dimensionValue[1]) * parseFloat(dimensionValue[2]) : 0;

Risyandi

/**
 * Risyandi - 2022
 * how to create string to encode :
 * first we have a data array as input
 * for the example : [a, a, b, b, b, c, c] 
 * and for the expected result should be appear like this 
 * for the expected result : a2b3c2
 */

function stringEncode(input) {

Risyandi

/**
 * Risyandi - 2021
 * how to create increment to triple number.
 * first we have value from  looping with initial duplicate 3.
 * and the expected result like this :
 * 111 222 333
 * 111 222 333
 * 111 222 333
 * 444 555 666
 * 444 555 666

Risyandi

let dataProps = [{
    "id": 1,
    "mat_doc": "5000001724",
    "mat_doc_year": 2020,
    "mat_doc_item": 1,
    "ref_doc_num": "SJ1234567892",
    "header_text": null,
    "posting_date": "2020-08-09T17:00:00.000Z",
    "doc_date": "2020-08-09T17:00:00.000Z",
    "move_type": "101",