JS-Callback

practice.js

@@ -27,14 +27,16 @@
   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'];
 
-first(names, function(firstName){
-  console.log('The first name in names is ' + firstName);
-  return firstName;
+first(names, function(firstName) {
+    console.log('The first name in names is ' + firstName);
+    return firstName;
 });
 // Do not edit the code above.
 
@@ -47,12 +49,14 @@ 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){
-  console.log('The last name in names is ' + lastName);
-  return lastName;
+last(names, function(lastName) {
+    console.log('The last name in names is ' + lastName);
+    return lastName;
 });
 // Do not edit the code above.
 
@@ -65,11 +69,13 @@ last(names, function(lastName){
   Invoke the callback, passing in the product of the two numbers multiplied as the argument.
 */
 
-//Code Here
+function multiply(n1, n2, callback) {
+    callback(n1 * n2)
+}
 
 // Do not edit the code below.
-multiply(4, 3, function(answer){
-  console.log('The answer is ' + answer); //should console.log "The answer is 12"
+multiply(4, 3, function(answer) {
+    console.log('The answer is ' + answer); //should console.log "The answer is 12"
 });
 // Do not edit the code above.
 
@@ -84,15 +90,21 @@ 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) {
+    array.forEach(function(n) {
+        name === n ? callback(true) : callback(false);
+    });
+
+}
+
 
 // Do not edit the code below.
-contains(names, 'Oscar', function(result){
-  if(result === true){
-    console.log('Oscar is in the array');
-  } else {
-    console.log('Oscar is not in the array');
-  }
+contains(names, 'Oscar', function(result) {
+    if (result === true) {
+        console.log('Oscar is in the array');
+    } else {
+        console.log('Oscar is not in the array');
+    }
 });
 // Do not edit the code above.
 
@@ -105,11 +117,25 @@ 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) {
+    console.log(array)
+    for (i = 0; i < array.length; i++) {
+        for (j = 0; j < array.length; j++) {
+            if (i != j) {
+                if (array[i] === array[j]) {
+                    array.splice(i, 1);
+                }
+            }
+        }
+    }
+    callback(array);
+}
 
 // Do not edit the code below.
-uniq(names, function(uniqArr){
-  console.log('The new names array with all the duplicate items removed is ', uniqArr);
+uniq(names, function(uniqArr) {
+    console.log('The new names array with all the duplicate items removed is ', uniqArr);
 });
 // Do not edit the code above.
 
@@ -122,11 +148,15 @@ 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) {
+    array.forEach(function(name, index) {
+        callback(name, index)
+    })
+}
 
 // Do not edit the code below.
-each(names, function(item, indice){
-  console.log('The item in the ' + indice + ' position is ' + item)
+each(names, function(item, indice) {
+    console.log('The item in the ' + indice + ' position is ' + item)
 });
 // Do not edit the code above.
 
@@ -139,31 +169,36 @@ 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) {
+    users.forEach(function(n) {
+        if (n.id === id) {
+            callback(n);
+        }
+    })
+}
 
 // Do not edit the code below.
-var users = [
-  {
-    id: '12d',
-    email: 'aodhan@boom.camp',
-    name: 'Aodhan',
-    address: '167 East 500 North'
-  },
-  {
-    id: '15a',
-    email: 'greg@boom.camp',
-    name: 'Greg',
-    address: '135 East 320 North'
-  },
-  {
-    id: '16t',
-    email: 'Oscar@boom.camp',
-    name: 'Oscar',
-    address: '192 East 32 North'
-  },
+var users = [{
+        id: '12d',
+        email: 'aodhan@boom.camp',
+        name: 'Aodhan',
+        address: '167 East 500 North'
+    },
+    {
+        id: '15a',
+        email: 'greg@boom.camp',
+        name: 'Greg',
+        address: '135 East 320 North'
+    },
+    {
+        id: '16t',
+        email: 'Oscar@boom.camp',
+        name: 'Oscar',
+        address: '192 East 32 North'
+    },
 ];
 
-getUserById(users, '16t', function(user){
-  console.log('The user with the id 16t has the email of ' + user.email + ' the name of ' + user.name + ' and the address of ' + user.address);
+getUserById(users, '16t', function(user) {
+    console.log('The user with the id 16t has the email of ' + user.email + ' the name of ' + user.name + ' and the address of ' + user.address);
 });
-// Do not edit the code above.
+// Do not edit the code above.

user.json

@@ -1,4 +1,4 @@
 {
-  "name": "",
-  "email": ""
-}
+    "name": "Rolando Koji E Adriano Jr",
+    "email": "rolando.adriano@boom.camp"
+}