diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..62c8935
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea/
\ No newline at end of file
diff --git a/src/start.html b/src/start.html
index f3e471e..f17d8d4 100644
--- a/src/start.html
+++ b/src/start.html
@@ -3,8 +3,44 @@
 <head>
     <meta charset="UTF-8">
     <title>Starting JS</title>
+
 </head>
 <body>
 
+<h1> hello javascript</h1>
+
+<p> you are so nice!</p>
+
 </body>
+
+<script type="text/javascript" src="http://underscorejs.org/underscore.js">
+</script>
+
+<script type="text/javascript">
+    var array = [2, 4, 6, 18, 10, -3];
+    var group = _.groupBy(array, function (num) {
+        return num % 2
+    });
+    console.log(group);
+    console.log(_.max(array));
+</script>
+
+<script type=" text/javascript">
+    var x =1;
+    for (var i = 1; i < 6; i++) {
+        x *= i;
+    }
+
+    console.log(x);
+
+    function factorielle(x) {
+        var x2 = 1;
+        for (var i = 1; i < x+1; i++) {
+            x2 *= i;
+        }
+        return x2;
+    }
+    console.log(factorielle(8));
+
+</script>
 </html>
\ No newline at end of file
diff --git a/src/start.js b/src/start.js
new file mode 100644
index 0000000..e85865d
--- /dev/null
+++ b/src/start.js
@@ -0,0 +1,3 @@
+var x = 2+2;
+console.log(x);
+
diff --git a/src/types/number.js b/src/types/number.js
new file mode 100644
index 0000000..5dd4218
--- /dev/null
+++ b/src/types/number.js
@@ -0,0 +1,16 @@
+var x = 2 ;
+console.log(typeof x
+);
+
+x=x+0.2;
+console.log("x: ",x, typeof x
+);
+
+x=parseInt("4");
+console.log("x: ",x, typeof x);
+
+var y = parseFloat("2.345");
+console.log("y: ",y,typeof y);
+
+var z = parseFloat("ah ah ah");
+console.log("z: ",z , typeof z);
diff --git a/src/types/string.js b/src/types/string.js
new file mode 100644
index 0000000..e6c14f3
--- /dev/null
+++ b/src/types/string.js
@@ -0,0 +1,38 @@
+
+var string = "hello World";
+
+string +=" !";
+
+console.log("string : ", string);
+
+var index = string.indexOf("lo");
+console.log("index of lo : ",index);
+
+string.indexOf("jo");
+console.log("index of jo : ",index);
+
+function contains(haystack, needle){
+return (haystack.indexOf(needle)>=0);
+}
+
+console.log("true ou pas true : ", contains("jack", "ack"), contains("bourde", "h"), contains("jim", "jim"));
+console.log("jack is back".includes("ack"));
+
+
+var hello = "hello world";
+var found = hello.search(/orl/);
+var alsoFound = hello.search(/world/i);
+console.log("found: ", found, "also: ", alsoFound);
+
+var x = /(.)*(world)/i.test("hello World");
+console.log("x : ",x);
+
+var strange = /(.)*(world)/i.test("hello World here");
+console.log("strange : ",strange);
+
+var moreStrict = /(.)*(world)$/i.test("hello World here");
+console.log("moreStrict : ",moreStrict);
+
+
+console.log("abcdef".substr(1,2)); // returns "bc" : return 2 elements (second parameter) the elements b and the one after b.
+console.log("abcdef".substring(1,2)); // returns "b" : substring  takes indices. You can remember because it's the only one with an 'i' in the name.
\ No newline at end of file
