readme updated

Author: MohiuddinRabby

README.md

@@ -52,3 +52,21 @@ const arrFour = Array(10 /**declaring array length 10 */);
 console.log(arrFour, arrFour.length);
 //output: [ <10 empty items> ] 10
 ```
+
+> Array traverse
+
+```js
+const arr = [1, 2, 3, 4, 5, 122, 20, 35, 56, 87, 31, 9, 35];
+let sum = 0;
+let maxNum = arr[0];
+for (let i = 0; i < arr.length; i++) {
+ sum = sum + arr[i];
+ if (arr[i] > maxNum) {
+ maxNum = arr[i];
+ }
+}
+const avg = sum / arr.length;
+console.log(`average: ${avg}`);
+console.log(`sum is ${sum}`);
+console.log(`max num is : ${maxNum}`);
+```