diff --git a/practice.js b/practice.js
index a9e0f69..8c073a8 100644
--- a/practice.js
+++ b/practice.js
@@ -28,7 +28,14 @@
 */
 
 // Code Here
+// var ourArr = [1,2,3];
+function first(array, callback){
+  for(i in array){
+    callback(array[0]);
+  }
+}
 
+// first(ourArr);
 // Do not edit the code below.
 var names = ['Aodhan', 'Greg', 'Jake', 'Oscar', 'Aodhan', 'Tanner', 'Greg'];
 
@@ -48,6 +55,11 @@ first(names, function(firstName){
 */
 
 //Code Here
+function last(array, callback){
+  for(i in array){
+    callback(array[array.length-1]);
+  }
+}
 
 // Do not edit the code below.
 last(names, function(lastName){
@@ -66,7 +78,9 @@ last(names, function(lastName){
 */
 
 //Code Here
-
+function multiply(x, n, callback){
+  callback(x*n);
+}
 // Do not edit the code below.
 multiply(4, 3, function(answer){
   console.log('The answer is ' + answer); //should console.log "The answer is 12"
@@ -85,7 +99,11 @@ multiply(4, 3, function(answer){
 */
 
 //Code Here
-
+function contains(array, name, callback){
+  for(i in array){
+    array[i] == name ? callback(true) : callback(false);
+  }
+}
 // Do not edit the code below.
 contains(names, 'Oscar', function(result){
   if(result === true){
@@ -106,7 +124,10 @@ contains(names, 'Oscar', function(result){
 */
 
 //Code Here
-
+function uniq(array, callback){
+  var thisArr = array.filter((item, index) => array.indexOf(item) === index);
+  callback(thisArr);
+}
 // Do not edit the code below.
 uniq(names, function(uniqArr){
   console.log('The new names array with all the duplicate items removed is ', uniqArr);
@@ -123,7 +144,11 @@ uniq(names, function(uniqArr){
 */
 
 //Code Here
-
+function each(names, callback){
+  for(var i = 0; i<names.length; i++){
+    callback(names[i], i);
+  }
+}
 // Do not edit the code below.
 each(names, function(item, indice){
   console.log('The item in the ' + indice + ' position is ' + item)
@@ -140,6 +165,13 @@ each(names, function(item, indice){
 */
 
 // Code here
+function getUserById(array, id, callback){
+  for(i in array){
+    if(array[i].id === id){
+      callback(array[i]);
+    }
+  }
+}
 
 // Do not edit the code below.
 var users = [
diff --git a/user.json b/user.json
index 4ac80a0..987ce8f 100644
--- a/user.json
+++ b/user.json
@@ -1,4 +1,4 @@
 {
-  "name": "",
-  "email": ""
+  "name": "Francisco R. Ifurung",
+  "email": "francisco.ifurung@boom.camp"
 }