Data commit

Task/Collections/Apex/collections-1.apex

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+// Create an empty list of String
+List<String> my_list = new List<String>();
+// Create a nested list
+List<List<Set<Integer>>> my_list_2 = new List<List<Set<Integer>>>();

Task/Collections/Apex/collections-2.apex

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+List<Integer> myList = new List<Integer>(); // Define a new list
+myList.add(47);                    // Adds a second element of value 47 to the end
+                                       // of the list
+Integer i = myList.get(0);                   // Retrieves the element at index 0
+myList.set(0, 1);                           // Adds the integer 1 to the list at index 0
+myList.clear();                    // Removes all elements from the list

Task/Collections/Apex/collections-3.apex

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+String[] colors = new List<String>();
+List<String> colors = new String[1];
+colors[0] = 'Green';

Task/Collections/Apex/collections-4.apex

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+Set<String> s1 = new Set<String>{'a', 'b + c'}; // Defines a new set with two elements
+Set<String> s2 = new Set<String>(s1); // Defines a new set that contains the
+                                     // elements of the set created in the previous step

Task/Collections/Apex/collections-5.apex

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+Set<Integer> s = new Set<Integer>(); // Define a new set
+s.add(1);                            // Add an element to the set
+System.assert(s.contains(1));        // Assert that the set contains an element
+s.remove(1);                         // Remove the element from the set

Task/Collections/Apex/collections-6.apex

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+Map<String, String> country_currencies = new Map<String, String>();
+Map<ID, Set<String>> m = new Map<ID, Set<String>>();
+Map<String, String> MyStrings = new Map<String, String>{'a' => 'b', 'c' => 'd'.toUpperCase()};

Task/Collections/Apex/collections-7.apex

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+Map<Integer, String> m = new Map<Integer, String>(); // Define a new map
+m.put(1, 'First entry');                  // Insert a new key-value pair in the map
+m.put(2, 'Second entry');                  // Insert a new key-value pair in the map
+System.assert(m.containsKey(1));  // Assert that the map contains a key
+String value = m.get(2);               // Retrieve a value, given a particular key
+System.assertEquals('Second entry', value);
+Set<Integer> s = m.keySet();       // Return a set that contains all of the keys in the map