diff --git a/quiz/part1/soal1.js b/quiz/part1/soal1.js
new file mode 100644
index 0000000..da826b2
--- /dev/null
+++ b/quiz/part1/soal1.js
@@ -0,0 +1,17 @@
+function angkaPrima(angka) {
+  // you can only write your code here!
+  if (angka < 2) return false;
+  for (let i = 2; i <= Math.sqrt(angka); i++) {
+    if (angka % i === 0) {
+      return false;
+    }
+  }
+  return true;
+}
+
+// TEST CASES
+console.log(angkaPrima(3)); // true
+console.log(angkaPrima(7)); // true
+console.log(angkaPrima(6)); // false
+console.log(angkaPrima(23)); // true
+console.log(angkaPrima(33)); // false
diff --git a/quiz/part1/soal2.js b/quiz/part1/soal2.js
new file mode 100644
index 0000000..bd7cdeb
--- /dev/null
+++ b/quiz/part1/soal2.js
@@ -0,0 +1,18 @@
+//cari faktor persekutuan terbesar
+function fpb(angka1, angka2) {
+  // you can only write your code here!
+  let min = Math.min(angka1, angka2);
+  for (let i = min; i > 0; i--) {
+    if (angka1 % i === 0 && angka2 % i === 0) {
+      return i;
+    }
+  }
+  return 1;
+}
+
+// TEST CASES
+console.log(fpb(12, 16)); // 4
+console.log(fpb(50, 40)); // 10
+console.log(fpb(22, 99)); // 11
+console.log(fpb(24, 36)); // 12
+console.log(fpb(17, 23)); // 1
diff --git a/quiz/part1/soal3.js b/quiz/part1/soal3.js
new file mode 100644
index 0000000..2205031
--- /dev/null
+++ b/quiz/part1/soal3.js
@@ -0,0 +1,17 @@
+function cariMedian(arr) {
+  // you can only write your code here!
+  const n = arr.length;
+  arr.sort((a, b) => a - b);
+  if (n % 2 === 0) {
+    return (arr[n / 2 - 1] + arr[n / 2]) / 2;
+  } else {
+    return arr[Math.floor(n / 2)];
+  }
+}
+
+// TEST CASES
+console.log(cariMedian([1, 2, 3, 4, 5])); // 3
+console.log(cariMedian([1, 3, 4, 10, 12, 13])); // 7
+console.log(cariMedian([3, 4, 7, 6, 10])); // 6
+console.log(cariMedian([1, 3, 3])); // 3
+console.log(cariMedian([7, 7, 8, 8])); // 7.5
diff --git a/quiz/part1/soal4.js b/quiz/part1/soal4.js
new file mode 100644
index 0000000..4ac18e4
--- /dev/null
+++ b/quiz/part1/soal4.js
@@ -0,0 +1,36 @@
+function cariModus(arr) {
+  // you can only write your code here!
+  var freq = {};
+  var maxCount = 0;
+  var modus = -1;
+
+  // Hitung frekuensi setiap angka
+  for (var i = 0; i < arr.length; i++) {
+    freq[arr[i]] = (freq[arr[i]] || 0) + 1;
+    if (freq[arr[i]] > maxCount) {
+      maxCount = freq[arr[i]];
+    }
+  }
+
+  // Jika semua angka sama atau semua angka unik
+  if (maxCount === arr.length || maxCount === 1) {
+    return -1;
+  }
+
+  // Cari modus pertama yang muncul
+  for (var j = 0; j < arr.length; j++) {
+    if (freq[arr[j]] === maxCount) {
+      modus = arr[j];
+      break;
+    }
+  }
+
+  return modus;
+}
+
+// TEST CASES
+console.log(cariModus([10, 4, 5, 2, 4])); // 4
+console.log(cariModus([5, 10, 10, 6, 5])); // 5
+console.log(cariModus([10, 3, 1, 2, 5])); // -1
+console.log(cariModus([1, 2, 3, 3, 4, 5])); // 3
+console.log(cariModus([7, 7, 7, 7, 7])); // -1
diff --git a/quiz/part1/soal5.js b/quiz/part1/soal5.js
new file mode 100644
index 0000000..a171dc1
--- /dev/null
+++ b/quiz/part1/soal5.js
@@ -0,0 +1,23 @@
+//sistem ubah hurufnya misal huruf a diubah menjadi b, c menjadi d, b menjadi c, z menjadi a
+//intinya ubah huruf menjadi huruf setelahnya
+function ubahHuruf(kata) {
+  // you can only write your code here!
+  let result = "";
+  for (let i = 0; i < kata.length; i++) {
+    let charCode = kata.charCodeAt(i);
+    if (charCode === 122) {
+      // 'z'
+      result += String.fromCharCode(97); // 'a'
+    } else {
+      result += String.fromCharCode(charCode + 1);
+    }
+  }
+  return result;
+}
+
+// TEST CASES
+console.log(ubahHuruf("wow")); // xpx
+console.log(ubahHuruf("developer")); // efwfmpqfs
+console.log(ubahHuruf("javascript")); // kbwbtdsjqu
+console.log(ubahHuruf("keren")); // lfsfo
+console.log(ubahHuruf("semangat")); // tfnbohbu
diff --git a/quiz/part2/soal1.js b/quiz/part2/soal1.js
new file mode 100644
index 0000000..d29a49f
--- /dev/null
+++ b/quiz/part2/soal1.js
@@ -0,0 +1,21 @@
+function digitPerkalianMinimum(angka) {
+  // you can only write your code here!
+  let minDigits = Infinity;
+  for (let i = 1; i <= Math.sqrt(angka); i++) {
+    if (angka % i === 0) {
+      let j = angka / i;
+      let digits = (i.toString() + j.toString()).length;
+      if (digits < minDigits) {
+        minDigits = digits;
+      }
+    }
+  }
+  return minDigits;
+}
+
+// TEST CASES
+console.log(digitPerkalianMinimum(24)); // 2
+console.log(digitPerkalianMinimum(90)); // 3
+console.log(digitPerkalianMinimum(20)); // 2
+console.log(digitPerkalianMinimum(179)); // 4
+console.log(digitPerkalianMinimum(1)); // 2
diff --git a/quiz/part2/soal2.js b/quiz/part2/soal2.js
new file mode 100644
index 0000000..bc13d12
--- /dev/null
+++ b/quiz/part2/soal2.js
@@ -0,0 +1,22 @@
+//saran sih pake bubblesort walau tidak efisien tapi bagus buat belajar sorting
+function urutkanAbjad(str) {
+  // you can only write your code here!
+  let arr = str.split("");
+  for (let i = 0; i < arr.length - 1; i++) {
+    for (let j = 0; j < arr.length - i - 1; j++) {
+      if (arr[j] > arr[j + 1]) {
+        // Swap arr[j] and arr[j + 1]
+        let temp = arr[j];
+        arr[j] = arr[j + 1];
+        arr[j + 1] = temp;
+      }
+    }
+  }
+  return arr.join("");
+}
+// TEST CASES
+console.log(urutkanAbjad("hello")); // 'ehllo'
+console.log(urutkanAbjad("truncate")); // 'acenrttu'
+console.log(urutkanAbjad("developer")); // 'deeeloprv'
+console.log(urutkanAbjad("software")); // 'aeforstw'
+console.log(urutkanAbjad("aegis")); // 'aegis'
diff --git a/quiz/part2/soal3.js b/quiz/part2/soal3.js
new file mode 100644
index 0000000..f1afed0
--- /dev/null
+++ b/quiz/part2/soal3.js
@@ -0,0 +1,21 @@
+//TIPS: gunakan method toUpperCase() dan toLowerCase()
+function tukarBesarKecil(kalimat) {
+  // you can only write your code here!
+  let result = "";
+  for (let i = 0; i < kalimat.length; i++) {
+    let char = kalimat[i];
+    if (char === char.toUpperCase()) {
+      result += char.toLowerCase();
+    } else {
+      result += char.toUpperCase();
+    }
+  }
+  return result;
+}
+
+// TEST CASES
+console.log(tukarBesarKecil("Hello World")); // "hELLO wORLD"
+console.log(tukarBesarKecil("I aM aLAY")); // "i Am Alay"
+console.log(tukarBesarKecil("My Name is Bond!!")); // "mY nAME IS bOND!!"
+console.log(tukarBesarKecil("IT sHOULD bE me")); // "it Should Be ME"
+console.log(tukarBesarKecil("001-A-3-5TrdYW")); // "001-a-3-5tRDyw"
diff --git a/quiz/part2/soal4.js b/quiz/part2/soal4.js
new file mode 100644
index 0000000..177451a
--- /dev/null
+++ b/quiz/part2/soal4.js
@@ -0,0 +1,29 @@
+/*
+Diberikan sebuah function checkAB(str) yang menerima satu parameter berupa string. function tersebut mengembalikan nilai true jika di dalam string tersebut terdapat karakter a dan b yang memiliki jarak 3 karakter lain minimal satu kali. Jika tidak ditemukan sama sekali, kembalikan nilai false. Jarak bisa dari a ke b, atau b ke a.
+
+contoh:
+barbarian kenapa bisa true?
+karena di bagian 'barian' terdapat b dipisah 3 karakter ari(totalnya 3) dan ketemu a
+
+Spasi juga dianggap sebagai karakter
+*/
+
+function checkAB(num) {
+  // you can only write your code here!
+  for (let i = 0; i < num.length; i++) {
+    if (
+      (num[i] === "a" && num[i + 4] === "b") ||
+      (num[i] === "b" && num[i + 4] === "a")
+    ) {
+      return true;
+    }
+  }
+  return false;
+}
+
+// TEST CASES
+console.log(checkAB("lane borrowed")); // true
+console.log(checkAB("i am sick")); // false
+console.log(checkAB("you are boring")); // true
+console.log(checkAB("barbarian")); // true
+console.log(checkAB("bacon and meat")); // false
diff --git a/quiz/part3/soal1.js b/quiz/part3/soal1.js
new file mode 100644
index 0000000..f78c7c8
--- /dev/null
+++ b/quiz/part3/soal1.js
@@ -0,0 +1,28 @@
+function changeMe(arr) {
+  if (arr.length === 0) {
+    console.log("");
+    return;
+  }
+  for (let i = 0; i < arr.length; i++) {
+    let person = arr[i];
+    let obj = {
+      firstName: person[0] || "",
+      lastName: person[1] || "",
+      gender: person[2] || "",
+    };
+    if (person[3] && typeof person[3] === "number" && person[3] <= 2023) {
+      obj.age = 2023 - person[3];
+    } else {
+      obj.age = "Invalid Birth Year";
+    }
+    console.log(`${i + 1}. ${obj.firstName} ${obj.lastName}:`);
+    console.log(obj);
+  }
+}
+
+// TEST CASES
+changeMe([
+  ["Christ", "Evans", "Male", 1982],
+  ["Robert", "Downey", "Male"],
+]);
+changeMe([]);
diff --git a/quiz/part3/soal2.js b/quiz/part3/soal2.js
new file mode 100644
index 0000000..14cda42
--- /dev/null
+++ b/quiz/part3/soal2.js
@@ -0,0 +1,40 @@
+function shoppingTime(memberId, money) {
+  if (!memberId || memberId === "") {
+    return "Mohon maaf, toko X hanya berlaku untuk member saja";
+  }
+  if (money === undefined || money < 50000) {
+    return "Mohon maaf, uang tidak cukup";
+  }
+
+  const items = [
+    { name: "Sepatu Stacattu", price: 1500000 },
+    { name: "Baju Zoro", price: 500000 },
+    { name: "Baju H&N", price: 250000 },
+    { name: "Sweater Uniklooh", price: 175000 },
+    { name: "Casing Handphone", price: 50000 },
+  ];
+
+  let listPurchased = [];
+  let changeMoney = money;
+
+  for (let i = 0; i < items.length; i++) {
+    if (changeMoney >= items[i].price) {
+      listPurchased.push(items[i].name);
+      changeMoney -= items[i].price;
+    }
+  }
+
+  return {
+    memberId: memberId,
+    money: money,
+    listPurchased: listPurchased,
+    changeMoney: changeMoney,
+  };
+}
+
+// TEST CASES
+console.log(shoppingTime("1820RzKrnWn08", 2475000));
+console.log(shoppingTime("82Ku8Ma742", 170000));
+console.log(shoppingTime("", 2475000));
+console.log(shoppingTime("234JdhweRxa53", 15000));
+console.log(shoppingTime());
diff --git a/quiz/part3/soal3.js b/quiz/part3/soal3.js
new file mode 100644
index 0000000..7c2742f
--- /dev/null
+++ b/quiz/part3/soal3.js
@@ -0,0 +1,93 @@
+function countProfit(shoppers) {
+  var listBarang = [
+    ["Sepatu Stacattu", 1500000, 10],
+    ["Baju Zoro", 500000, 2],
+    ["Sweater Uniklooh", 175000, 1],
+  ];
+
+  // you can only write your code here!
+  var result = [];
+  for (var i = 0; i < listBarang.length; i++) {
+    var product = listBarang[i][0];
+    var price = listBarang[i][1];
+    var stock = listBarang[i][2];
+    var shoppersList = [];
+    var totalProfit = 0;
+    var leftOver = stock;
+
+    for (var j = 0; j < shoppers.length; j++) {
+      if (shoppers[j].product === product && shoppers[j].amount <= leftOver) {
+        shoppersList.push(shoppers[j].name);
+        totalProfit += shoppers[j].amount * price;
+        leftOver -= shoppers[j].amount;
+      }
+    }
+
+    result.push({
+      product: product,
+      shoppers: shoppersList,
+      leftOver: leftOver,
+      totalProfit: totalProfit,
+    });
+  }
+  return result;
+}
+
+// TEST CASES
+console.log(
+  countProfit([
+    { name: "Windi", product: "Sepatu Stacattu", amount: 2 },
+    { name: "Vanessa", product: "Sepatu Stacattu", amount: 3 },
+    { name: "Rani", product: "Sweater Uniklooh", amount: 2 },
+  ])
+);
+//[ { product: 'Sepatu Stacattu',
+//   shoppers: [ 'Windi', 'Vanessa' ],
+//   leftOver: 5,
+//   totalProfit: 7500000 },
+// { product: 'Baju Zoro',
+//   shoppers: [],
+//   leftOver: 2,
+//   totalProfit: 0 },
+// { product: 'Sweater Uniklooh',
+//   shoppers: [],
+//   leftOver: 1,
+//   totalProfit: 0 } ]
+
+console.log(
+  countProfit([
+    { name: "Windi", product: "Sepatu Stacattu", amount: 8 },
+    { name: "Vanessa", product: "Sepatu Stacattu", amount: 10 },
+    { name: "Rani", product: "Sweater Uniklooh", amount: 1 },
+    { name: "Devi", product: "Baju Zoro", amount: 1 },
+    { name: "Lisa", product: "Baju Zoro", amount: 1 },
+  ])
+);
+// [ { product: 'Sepatu Stacattu',
+//     shoppers: [ 'Windi' ],
+//     leftOver: 2,
+//     totalProfit: 12000000 },
+//   { product: 'Baju Zoro',
+//     shoppers: [ 'Devi', 'Lisa' ],
+//     leftOver: 0,
+//     totalProfit: 1000000 },
+//   { product: 'Sweater Uniklooh',
+//     shoppers: [ 'Rani' ],
+//     leftOver: 0,
+//     totalProfit: 175000 } ]
+console.log(
+  countProfit([{ name: "Windi", product: "Sepatu Naiki", amount: 5 }])
+);
+// [ { product: 'Sepatu Stacattu',
+//     shoppers: [],
+//     leftOver: 10,
+//     totalProfit: 0 },
+//   { product: 'Baju Zoro',
+//     shoppers: [],
+//     leftOver: 2,
+//     totalProfit: 0 },
+//   { product: 'Sweater Uniklooh',
+//     shoppers: [],
+//     leftOver: 1,
+//     totalProfit: 0 } ]
+console.log(countProfit([])); //[]
diff --git a/quiz/ujian/soal1.js b/quiz/ujian/soal1.js
new file mode 100644
index 0000000..dff4c56
--- /dev/null
+++ b/quiz/ujian/soal1.js
@@ -0,0 +1,47 @@
+function deepSum(arr) {
+  // Code disini
+  if (arr.length === 0) {
+    return "No number";
+  }
+  let total = 0;
+  for (let i = 0; i < arr.length; i++) {
+    for (let j = 0; j < arr[i].length; j++) {
+      for (let k = 0; k < arr[i][j].length; k++) {
+        total += arr[i][j][k];
+      }
+    }
+  }
+  return total;
+}
+
+//TEST CASE
+console.log(
+  deepSum([
+    [
+      [4, 5, 6],
+      [9, 1, 2, 10],
+      [9, 4, 3],
+    ],
+    [
+      [4, 14, 31],
+      [9, 10, 18, 12, 20],
+      [1, 4, 90],
+    ],
+    [
+      [2, 5, 10],
+      [3, 4, 5],
+      [2, 4, 5, 10],
+    ],
+  ])
+); // 316
+
+console.log(
+  deepSum([
+    [[20, 10], [15], [1, 1]],
+    [[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11], [2], [9, 11]],
+    [[3, 5, 1], [1, 5, 3], [1]],
+    [[2]],
+  ])
+); // 156
+
+console.log(deepSum([])); // No number
diff --git a/quiz/ujian/soal2.js b/quiz/ujian/soal2.js
new file mode 100644
index 0000000..b997dff
--- /dev/null
+++ b/quiz/ujian/soal2.js
@@ -0,0 +1,28 @@
+function naikAngkot(arrPenumpang) {
+  rute = ["A", "B", "C", "D", "E", "F"];
+  //your code here
+  var result = [];
+  for (var i = 0; i < arrPenumpang.length; i++) {
+    var penumpang = arrPenumpang[i];
+    var obj = {
+      penumpang: penumpang[0],
+      naikDari: penumpang[1],
+      tujuan: penumpang[2],
+      bayar: (rute.indexOf(penumpang[2]) - rute.indexOf(penumpang[1])) * 2000,
+    };
+    result.push(obj);
+  }
+  return result;
+}
+
+//TEST CASE
+console.log(
+  naikAngkot([
+    ["Dimitri", "B", "F"],
+    ["Icha", "A", "B"],
+  ])
+);
+// [ { penumpang: 'Dimitri', naikDari: 'B', tujuan: 'F', bayar: 8000 },
+//   { penumpang: 'Icha', naikDari: 'A', tujuan: 'B', bayar: 2000 } ]
+
+console.log(naikAngkot([])); //[]
diff --git a/quiz/ujian/soal3.js b/quiz/ujian/soal3.js
new file mode 100644
index 0000000..85dac40
--- /dev/null
+++ b/quiz/ujian/soal3.js
@@ -0,0 +1,88 @@
+function highestScore(students) {
+  // Code disini
+  if (students.length === 0) {
+    return {};
+  }
+  let result = {};
+  for (let i = 0; i < students.length; i++) {
+    let student = students[i];
+    let className = student.class;
+
+    if (!result[className] || student.score > result[className].score) {
+      result[className] = {
+        name: student.name,
+        score: student.score,
+      };
+    }
+  }
+  return result;
+}
+
+// TEST CASE
+console.log(
+  highestScore([
+    {
+      name: "Dimitri",
+      score: 90,
+      class: "foxes",
+    },
+    {
+      name: "Alexei",
+      score: 85,
+      class: "wolves",
+    },
+    {
+      name: "Sergei",
+      score: 74,
+      class: "foxes",
+    },
+    {
+      name: "Anastasia",
+      score: 78,
+      class: "wolves",
+    },
+  ])
+);
+
+// {
+//   foxes: { name: 'Dimitri', score: 90 },
+//   wolves: { name: 'Alexei', score: 85 }
+// }
+
+console.log(
+  highestScore([
+    {
+      name: "Alexander",
+      score: 100,
+      class: "foxes",
+    },
+    {
+      name: "Alisa",
+      score: 76,
+      class: "wolves",
+    },
+    {
+      name: "Vladimir",
+      score: 92,
+      class: "foxes",
+    },
+    {
+      name: "Albert",
+      score: 71,
+      class: "wolves",
+    },
+    {
+      name: "Viktor",
+      score: 80,
+      class: "tigers",
+    },
+  ])
+);
+
+// {
+//   foxes: { name: 'Alexander', score: 100 },
+//   wolves: { name: 'Alisa', score: 76 },
+//   tigers: { name: 'Viktor', score: 80 }
+// }
+
+console.log(highestScore([])); //{}
diff --git a/quiz/ujian/soal4.js b/quiz/ujian/soal4.js
new file mode 100644
index 0000000..016f5fa
--- /dev/null
+++ b/quiz/ujian/soal4.js
@@ -0,0 +1,101 @@
+function graduates(students) {
+  // Code disini
+  if (students.length === 0) {
+    return {};
+  }
+  let result = {};
+  for (let i = 0; i < students.length; i++) {
+    let student = students[i];
+    let className = student.class;
+    if (!result[className]) {
+      result[className] = [];
+    }
+    if (student.score >= 75) {
+      result[className].push({
+        name: student.name,
+        score: student.score,
+      });
+    }
+  }
+  return result;
+}
+
+console.log(
+  graduates([
+    {
+      name: "Dimitri",
+      score: 90,
+      class: "foxes",
+    },
+    {
+      name: "Alexei",
+      score: 85,
+      class: "wolves",
+    },
+    {
+      name: "Sergei",
+      score: 74,
+      class: "foxes",
+    },
+    {
+      name: "Anastasia",
+      score: 78,
+      class: "wolves",
+    },
+  ])
+);
+
+// {
+//   foxes: [
+//     { name: 'Dimitri', score: 90 }
+//   ],
+//   wolves: [
+//     { name: 'Alexei' , score: 85 },
+//     { name: 'Anastasia', score: 78 }
+//   ]
+// }
+
+console.log(
+  graduates([
+    {
+      name: "Alexander",
+      score: 100,
+      class: "foxes",
+    },
+    {
+      name: "Alisa",
+      score: 76,
+      class: "wolves",
+    },
+    {
+      name: "Vladimir",
+      score: 92,
+      class: "foxes",
+    },
+    {
+      name: "Albert",
+      score: 71,
+      class: "wolves",
+    },
+    {
+      name: "Viktor",
+      score: 80,
+      class: "tigers",
+    },
+  ])
+);
+
+// {
+//   foxes: [
+//     { name: 'Alexander', score: 100 },
+//     { name: 'Vladimir', score: 92 }
+//   ],
+//   wolves: [
+//     { name: 'Alisa', score: 76 },
+//   ],
+//   tigers: [
+//     { name: 'Viktor', score: 80 }
+//   ]
+// }
+
+console.log(graduates([])); //{}