diff --git a/javascript/Day28/index.js b/javascript/Day28/index.js
new file mode 100644
index 0000000..5b43b25
--- /dev/null
+++ b/javascript/Day28/index.js
@@ -0,0 +1,77 @@
+let arr = [1, 2, 3, 4, 5];
+
+arr.unshift(-1);
+console.log(arr);
+arr.shift();
+console.log(arr);
+
+const isPresent = arr.includes(-1);
+
+console.log(isPresent);
+
+const reversedArray = arr.reverse();
+
+console.log(reversedArray);
+
+const arr2 = [10, 11, 12, 13, 14, 15];
+
+const arr3 = [-1, -2, -3, -4, -5];
+
+const newArray = arr.concat(arr2, arr3);
+
+console.log(newArray);
+
+const removedValues = arr.splice(4, 2);
+
+console.log(removedValues);
+console.log(arr);
+
+arr.splice(4, 2, -1, -2);
+
+console.log(arr);
+
+const stringArray = arr.toString();
+
+console.log(stringArray);
+
+const hypenArray = arr.join("_");
+console.log(arr.join(""));
+
+console.log(hypenArray);
+
+const sliceArray = arr.slice(3, 7);
+
+console.log(sliceArray, arr);
+
+arr.fill("z");
+console.log(arr);
+
+const lastIndex = arr.lastIndexOf("a");
+
+console.log(lastIndex);
+const index = arr.indexOf("z");
+
+console.log(index);
+
+if (index !== -1) {
+  console.log("found");
+} else {
+  console.log("not found");
+}
+console.log(Array.isArray(arr));
+
+const nestedArray = [1, 2, [3, 4, [-4, 5], 8], 6, 7];
+
+const flatArray = nestedArray.flat(2);
+console.log(flatArray);
+
+var a = [];
+a.unshift(1);
+a.unshift(22);
+a.shift();
+a.unshift(3, [4, 5]);
+a.shift();
+a.shift();
+a.shift();
+
+console.log(a);