View difference between Paste ID: CRYNFQ9P and 9ku6xDgW

 /*
  * @see https://success.salesforce.com/answers?id=90630000000hdCVAAY
  */
 trigger LaatsteCallMobileMiles on Task (after insert) {
 
     // Retrieve the email addresses of CreatedBy users for tasks currently
     // being processed by the trigger
 
     List<Task> newTasks = [
         SELECT Id, WhatId, Subject, CreatedDate, CreatedBy.Email
         FROM Task
         WHERE Id IN :Trigger.new
     ];
 
-    // Initialize a map of accounts to update, based on the Related To
+    // Initialize a map of qualyfing tasks, keyed on the Related To (WhatId)
-    // (WhatId) field on the task. The map will be keyed on the Account ID,
+    // field on the task. This will be used later to pull in Task.CreatedDate
-    // to make sure the same account is not included twice in a single DML
+    // when updating accounts
-    // operation.
+
     Map<Id, Task> qualifyingTasksByWhatId = new Map<Id, Task>();
-    Map<Id, Account> affectedAccountsById = new Map<Id, Account>();
+
     // Go through the new tasks and check to see whether the task qualifies
-    // Go through the new tasks and check to see whether the account shoudl
+    // based on the email address and subject criteria
-    // be updated, based on the email address and subject criteria
+
     for (Task eachTask : newTasks) {
         if (eachTask.WhatId != null) {
             if (eachTask.CreatedBy.Email.contains('@mobilemiles.nl')
                 && eachTask.Subject.contains('Made call to')) {
 
                 // Put the qualifying task in the map
-                // Construct the Account record to update
+
                 qualifyingTasksByWhatId.put(eachTask.WhatId, eachTask);
-                Account affectedAccount = new Account(
+
-                    Id = eachTask.WhatId,
+
-                    Laatste_activiteit_Mobile_Miles__c = eachTask.CreatedDate);
+
 
-                // Put the affected account in the map
+    // Look for accounts that were affected, by querying the account object.
     // This avoids situations where the task is not related to an account but
-                affectedAccountsById.put(affectedAccount.Id, affectedAccount);
+    // to some other type of record in the system.
 
     List<Account> affectedAccounts = [
         SELECT Id
         FROM Account
         WHERE Id IN :qualifyingTasksByWhatId.keySet()
     ];
-    if (!affectedAccountsById.isEmpty())
+
-        update affectedAccountsById.values();
+
 
     if (affectedAccounts.size() > 0) {
         for (Account eachAccount : affectedAccounts) {
             eachAccount.Laatste_activiteit_Mobile_Miles__c =
                 qualifyingTasksByWhatId.get(eachAccount.Id).CreatedDate;
         }
 
         update affectedAccounts;
     }
 }