Javascript 4-callbacks

practice.js

@@ -27,7 +27,10 @@
   Then invoke the callback function, passing in the first element in the array as it's argument.
 */
 
-// Code Here
+function first(array, callback){
+  callback(array[0]);
+}
+
 
 // Do not edit the code below.
 var names = ['Aodhan', 'Greg', 'Jake', 'Oscar', 'Aodhan', 'Tanner', 'Greg'];
@@ -47,7 +50,9 @@ first(names, function(firstName){
   Then invoke the callback, passing in the last element in the array as the argument.
 */
 
-//Code Here
+function last(array, callback){
+    callback(array[array.length -1])
+}
 
 // Do not edit the code below.
 last(names, function(lastName){
@@ -65,7 +70,9 @@ last(names, function(lastName){
   Invoke the callback, passing in the product of the two numbers multiplied as the argument.
 */
 
-//Code Here
+function multiply(num1, num2, callback){
+    callback(num1*num2)
+}
 
 // Do not edit the code below.
 multiply(4, 3, function(answer){
@@ -84,7 +91,10 @@ multiply(4, 3, function(answer){
   If the name does not exist, invoke the callback with false as the argument.
 */
 
-//Code Here
+function contains(array, name, callback){
+  if (array.includes(name)) callback(true)
+  else callback(false)
+}
 
 // Do not edit the code below.
 contains(names, 'Oscar', function(result){
@@ -105,7 +115,16 @@ contains(names, 'Oscar', function(result){
   Remove any duplicate values from the array, and invoke the callback with the modified array as an argument.
 */
 
-//Code Here
+function uniq(array, callback){
+
+  var uniqueArray = [];
+  for(i=0; i < array.length; i++){
+      if(uniqueArray.indexOf(array[i]) === -1) {
+          uniqueArray.push(array[i]);
+      }
+  }
+  callback(uniqueArray);
+}
 
 // Do not edit the code below.
 uniq(names, function(uniqArr){
@@ -122,7 +141,11 @@ uniq(names, function(uniqArr){
   For each name in the array, invoke the callback and pass in the name and the name's index as arguments.
 */
 
-//Code Here
+function each(array, callback){
+  for (val of array){
+    callback(val, array.indexOf(val))
+  }
+}
 
 // Do not edit the code below.
 each(names, function(item, indice){
@@ -139,7 +162,14 @@ each(names, function(item, indice){
   When the correct user object is found, invoke the callback with the user object as an argument.
 */
 
-// Code here
+function getUserById(users, id, callback){
+    for (val in users) {
+        if (users[val].id === id) {
+          callback(users[val]);
+        }
+    }
+
+}
 
 // Do not edit the code below.
 var users = [

user.json

@@ -1,4 +1,4 @@
 {
-  "name": "",
-  "email": ""
+  "name": "Lyza Mae B. Mirabete",
+  "email": "lyza.mirabete@boom.camp"
 }