diff --git a/index.js b/index.js
index 498fb74..c42386d 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,124 @@
 exports.sayWhat = function() {
   console.log(“What?!”);
 }
+exports.sayWhatSingle = function() {
+  console.log('What?!');
+}
+exports.sayWhatBacktick = function() {
+  console.log(`What?!`);
+}
 
 console.log('teste')
 console.log('bump');
+"use strict";
+var fs = require("fs");
+var child_process = require('child_process');
+
+exports.doSomething = function () {
+
+    for (var i = 0; i < 10; i--) {
+    }
+
+    for (var i = 10; i >= 0; i++) {
+    }
+
+    var x = 5;;
+
+    var key = 'key'
+
+    var object = {
+        key: 'yes!  '
+    }
+
+    if (!key in object) {
+        // operator precedence makes it equivalent to (!key) in object
+        // and type conversion makes it equivalent to (key ? "false" : "true") in object
+    }
+
+    function foo1(a, b, a) {
+        typeof a === undefined
+        console.log("value of the second a:", a);
+    }
+    
+    var bar = function (a, b, a) {
+        console.log("value of the second a:", a);
+    };
+    
+    function fn() {
+        x = 1;
+        return x;
+        x = 3; // this will never execute
+    }
+    
+    (() => {
+        try {
+            return 1; // 1 is returned but suspended until finally block ends
+        } catch (err) {
+            return 2;
+        } finally {
+            return 3; // 3 is returned before 1, which we did not expect
+        }
+    })();
+    
+    let foo2 = function () {
+        try {
+            return 1;
+        } catch (err) {
+            return 2;
+        } finally {
+            return 3;
+        }
+    };
+    
+    let result;
+    async function foo3() {
+        result += await somethingElse;
+    
+        result = result + await somethingElse;
+    
+        result = result + doSomething(await somethingElse);
+    }
+    
+    function* bar2() {
+        result += yield;
+    
+        result = result + (yield somethingElse);
+    
+        result = result + doSomething(yield somethingElse);
+    }
+    
+    child_process.exec('ls', function (err, data) {
+        console.log(data);
+    });
+    
+    var path = "user input";
+    child_process.exec('ls -l ' + path, function (err, data) {
+        console.log(data);
+    });
+    
+    function validateEmailFormat(string) {
+        var emailExpression = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
+    
+        return emailExpression.test(string);
+    }
+    
+    start = process.hrtime();
+    console.log(validateEmailFormat("baldwin@andyet.net"));
+    console.log(process.hrtime(start));
+    
+    start = process.hrtime();
+    console.log(validateEmailFormat("jjjjjjjjjjjjjjjjjjjjjjjjjjjj@ccccccccccccccccccccccccccccc.5555555555555555555555555555555555555555{"));
+    console.log(process.hrtime(start));
+    
+    start = process.hrtime();
+    console.log(validateEmailFormat("jjjjjjjjjjjjjjjjjjjjjjjjjjjj@ccccccccccccccccccccccccccccc.55555555555555555555555555555555555555555{"));
+    console.log(process.hrtime(start));
+    
+    start = process.hrtime();
+    console.log(validateEmailFormat("jjjjjjjjjjjjjjjjjjjjjjjjjjjj@ccccccccccccccccccccccccccccc.555555555555555555555555555555555555555555555555555555{"));
+    console.log(process.hrtime(start));
+    
+    
+    
+
+};