diff --git a/solutions/day-01/array/level1.js b/solutions/day-01/array/level1.js
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+// EXERCISE ARRAY
+// LEVEL 1
+const countries = [
+  "Albania",
+  "Bolivia",
+  "Canada",
+  "Denmark",
+  "Ethiopia",
+  "Finland",
+  "Germany",
+  "Hungary",
+  "Ireland",
+  "Japan",
+  "Kenya",
+];
+const webTechs = [
+  "HTML",
+  "CSS",
+  "JavaScript",
+  "React",
+  "Redux",
+  "Node",
+  "MongoDB",
+];
+
+// 1. Declare empaty array
+const decArr = Array();
+// console.log(decArr); // []
+
+// 2. Declare an array with more than 5 number of elements
+const fifveArr = ["a", "b", "c", "d", "e", "f"];
+// console.log(fifveArr); // [ 'a', 'b', 'c', 'd', 'e', 'f' ]
+
+// 3. Find the length of your array
+const lengthArr = [1, 2, 3, 4, 5, "b", "a", "y", "u"];
+// console.log(lengthArr.length); // 9
+
+// 4. Get the first item, the middle item and the last item of the array
+const getIndexArr = [1, 2, 3, 4, 5, 6, 7, 8];
+// console.log(getIndexArr[0]); // first item
+// console.log(getIndexArr[2]); // middle item but it static
+// console.log(Math.ceil(getIndexArr.length / 2)); // middle item but dinamis, u can use Math.ceil or Math.floor
+// console.log(getIndexArr[getIndexArr.length - 1]); // last index item
+
+// 5. Declare an array called mixedDataTypes, put different data types in the array and find the length of the array. The array size should be greater than 5
+const mixedDataTypes = [
+  1,
+  "aku sayang ibu",
+  true,
+  { ibu: "billie elish", bapak: "khalid" },
+  { profesi: ["tukang cukur", "penyanyi", "pengembala"] },
+  null,
+];
+// console.log(mixedDataTypes.length); // 6
+
+// 6. Declare an array variable name itCompanies and assign initial values Facebook, Google, Microsoft, Apple, IBM, Oracle and Amazon
+
+const itCompanies = [
+  "Facebook",
+  "Google",
+  "Microsoft",
+  "Apple",
+  "IBM",
+  "Oracle",
+  "Amazon",
+];
+// 7. Print the array using console.log()
+// console.log(itCompanies);
+
+// 8. Print the number of companies in the array
+// console.log(itCompanies.length); // 7
+
+// 9. Print the first company, middle and last company
+// console.log(itCompanies[0]); // Facebook
+// console.log(itCompanies[Math.floor(itCompanies.length / 2)]); // apple
+// console.log(itCompanies[itCompanies.length - 1]); // amazon
+
+// 10. Print out each company
+// for (let i = 0; i < itCompanies.length; i++) {
+//   const element = itCompanies[i];
+//   console.log(element);
+// }
+
+// 11. Change each company name to uppercase one by one and print them out
+let itCompanies2 = itCompanies.map((x) => x.toUpperCase());
+// console.log(itCompanies2);
+// [
+//     'FACEBOOK',
+//     'GOOGLE',
+//     'MICROSOFT',
+//     'APPLE',
+//     'IBM',
+//     'ORACLE',
+//     'AMAZON'
+//   ]
+
+// 12. Print the array like as a sentence: Facebook, Google, Microsoft, Apple, IBM,Oracle and Amazon are big IT companies.
+const sentence = itCompanies.toString();
+// console.log(`${sentence} are big IT companies` ); // Facebook,Google,Microsoft,Apple,IBM,Oracle,Amazon are big IT companies
+
+// 13. Check if a certain company exists in the itCompanies array. If it exist return the company else return a company is not found.
+// let findItcompanies = itCompanies.indexOf("Oracle");
+// if (findItcompanies != -1) {
+//   console.log(itCompanies[findItcompanies]);
+// } else {
+//   console.log("company is not found");
+// }
+
+// 14. filter out companies which have more than one 'o' without the filter method
+
diff --git a/solutions/day-01/array/level2.js b/solutions/day-01/array/level2.js
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diff --git a/solutions/day-01/helloworld.js b/solutions/day-01/helloworld.js
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+++ b/solutions/day-01/helloworld.js
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+console.log('MENCOBA MENGULANG JAVASCRIPT DARI AWAL')
\ No newline at end of file
diff --git a/solutions/day-01/index.html b/solutions/day-01/index.html
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--- /dev/null
+++ b/solutions/day-01/index.html
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+<!--! INLINE SCRIPT -->
+<!-- <!DOCTYPE html>
+<html>
+  <head>
+    <title>30DaysOfScript:Inline Script</title>
+  </head>
+  <body>
+    <button onclick="alert('Welcome to 30DaysOfJavaScript!')">Click Me</button>
+  </body>
+</html> -->
+<!-- INLINE SCRIPT -->
+
+<!--! INTERNAL SCRIPT -->
+<!--? Open the browser console to see the output from the console.log()  -->
+<!-- <!DOCTYPE html>
+<html>
+  <head>
+    <title>30DaysOfScript:Internal Script</title>
+    <script>
+      console.log('Welcome to 30DaysOfJavaScript')
+    </script>
+  </head>
+  <body></body>
+</html> -->
+
+<!-- <!DOCTYPE html>
+<html>
+  <head>
+    <title>30DaysOfScript:Internal Script</title>
+  </head>
+  <body>
+    <button onclick="alert('Welcome to 30DaysOfJavaScript!');">Click Me</button>
+    <script>
+      console.log('Welcome to 30DaysOfJavaScript')
+    </script>
+  </body>
+</html> -->
+<!--! INTERNAL SCRIPT  -->
+
+<!--! EXTERNAL SCRIPT -->
+<!-- HEAD -->
+
+<!-- <!DOCTYPE html>
+<html>
+  <head>
+    <title>30DaysOfJavaScript:External script</title>
+    <script src="introduction.js"></script>
+  </head>
+  <body></body>
+</html> -->
+
+<!-- BODY -->
+<!--? it could be in the header or in the body // Here is the recommended place -->
+<!-- <!DOCTYPE html>
+<html>
+  <head>
+    <title>30DaysOfJavaScript:External script</title>
+  </head>
+  <body>
+    <script src="introduction.js"></script>
+  </body>
+</html> -->
+<!--! EXTERNAL SCRIPT  -->
+
+<!--! MULTIPLE EXTERNAL SCRIPT -->
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Multiple External Scripts</title>
+  </head>
+  <body>
+    <!-- <script src="./introduction.js"></script>
+    <script src="./helloworld.js"></script> -->
+    <h1>halo semua</h1>
+  </body>
+</html>
+<!--! MULTIPLE EXTERNAL SCRIPT -->
+
+<!-- !VARIABLE -->
+<!-- ADA 3 -->
+<!-- VAR, LET, CONST -->
+<!-- KITA MENGGUNAKAN ES6 YAITU LET DAN CONST KARENA LET CONST ADALAH BLOCK SCOPE -->
+<!--! VARIABLE  -->
+
+<!--! ARRAY -->
+<!-- array dapat menyimpan multiple value, dan setiap value memilki index -->
+<!-- array itu paling cocok dipakek buat list -->
+<script>
+  // syntax
+  //   const arr = Array();
+  // or
+  // let arr = new Array()
+  //   console.log(arr);  // []
+
+  //   Umumnya seperti ini
+  const arr = [];
+  //   console.log(arr);
+
+  //   SEKARANG MENCARI LENGTH
+  //  LENGTH ITU PANJANG dari suatu array
+  //  kalau binggung sih sebenarnya bisa diitung aja berapa banyak elements dari variable arraynya
+
+  const numbers = [0, 3.14, 9.81, 37, 98.6, 100]; // array of numbers
+  const fruits = ["banana", "orange", "mango", "lemon"]; // array of strings, fruits
+  const vegetables = ["Tomato", "Potato", "Cabbage", "Onion", "Carrot"]; // array of strings, vegetables
+  const animalProducts = ["milk", "meat", "butter", "yoghurt"]; // array of strings, products
+  const webTechs = ["HTML", "CSS", "JS", "React", "Redux", "Node", "MongDB"]; // array of web technologies
+  const countries = ["Finland", "Denmark", "Sweden", "Norway", "Iceland"]; // array of strings, countries
+
+  // Print the array and its length
+  //   console.log("Numbers:", numbers);
+  //   console.log("Number of numbers:", numbers.length);
+  //   console.log("banyak length fruits: ", fruits.length); // lengthnya ada 4, indexnya ada 3 (karena dihitung dari nol)
+
+  // array juga dapat memilki elements/ items dengan tipe data yang berbeda beda
+  //   const arr = [
+  //     1,
+  //     "aku sayang ibu",
+  //     true,
+  //     { ibu: "billie elish", bapak: "khalid" },
+  //     { profesi: ["tukang cukur", "penyanyi", "pengembala"] },
+  //   ];
+
+  // membuat array dengan split
+  let js = "sekarang review ulang javascript";
+  const jadiArr = js.split("");
+  //console.log(jadiArr); // ["s", "e", "k", "a", "r", "a", "n", "g",.....]
+
+  //   Acces array
+  const accArr = ["bayu", "ini", "senin", "oke", "?"];
+  //   console.log(accArr[2]); // senin
+
+  //   Modify array
+  accArr[0] = "toyib";
+  //   console.log(accArr); // ["toyib", "ini", "senin", "oke", "?"]
+
+  //   METHOD ARRAY
+  // fill
+  const fillArr = Array(5).fill(9);
+  // console.log(fillArr); // [9,9,9,9,9]
+
+  // concat
+  const conArr1 = [1, 2, 3];
+  const conArr2 = [1, 2, 3];
+  const conArr3 = conArr1.concat(conArr2);
+  // console.log(conArr3);// [1, 2, 3, 1, 2, 3]
+
+  // length
+  const lengthArr = [1, 2, 3];
+  // console.log(lengthArr.length); // 3
+
+  // indexOf
+  // console.log(lengthArr.indexOf(3)); // 3 =>mencari index dengan parameter udah ditentukan
+  // console.log(lengthArr.indexOf(4)); // -1 => nilai default karena tidak ada di dalam list array
+
+  // toString
+  console.log(lengthArr.toString()); // 1,2,3 => menjadi string
+
+  // join
+  const webTechs = [
+    "HTML",
+    "CSS",
+    "JavaScript",
+    "React",
+    "Redux",
+    "Node",
+    "MongoDB",
+  ]; // List of web technologies
+
+  console.log(webTechs.join()); // "HTML,CSS,JavaScript,React,Redux,Node,MongoDB"
+  console.log(webTechs.join(" # ")); // "HTML # CSS # JavaScript # React # Redux # Node # MongoDB"
+</script>
+<!--! ARRAY -->
diff --git a/solutions/day-01/introduction.js b/solutions/day-01/introduction.js
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+console.log('WELCOME TO MY SOLUTION 30 DAYS REACT')
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diff --git a/solutions/day-01/level1.js b/solutions/day-01/level1.js
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+++ b/solutions/day-01/level1.js
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+console.log("try");
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