Update readme.md

Author: shekhardtu

readme.md

@@ -1 +1,25 @@
 # Sorting algorithms implementation in javascript
+
+## Javascript array function library
+
+#### Remove duplicates in an array
+```javascript
+var array = ["Mike","Matt","Nancy","Adam","Jenny","Nancy","Carl"];
+function removeDuplicate(array){
+  var uniqueNames = [];
+  $.each(names, function(i, el){
+      if($.inArray(el, uniqueNames) === -1) uniqueNames.push(el);
+  });
+  return uniqueNames;
+}
+```
+
+
+#### Calculate execution time in JS
+```javascript
+var startTime = new Date().getTime();
+function functionExecution();
+var endTime = new Date().getTime();
+var executionTime = endTime - startTime;
+console.log(executionTime);
+```