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If copy with: returns the same array, the instances of NSArray and Array share storage using the same copy-on-write optimization that is used when two instances of Array share storage. It calls the function for each element of the array and returns the array of results. Add multiple elements at the same time by passing another array or a sequence of any kind to the append contents Of: method.

To use our own sorting order, we need to supply a function as the argument of arr.

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Modifying Copies of Arrays Each array has an independent value that includes the values of all of its elements. An array that is the sole owner of its storage can perform mutating operations in place.

The same value can appear in an array multiple times at different positions. If you change a reference to an object in one array, only that array has a reference to the new object. In this case, the values stored in the array are references to objects that live outside the array.

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If you change a reference to an object in one array, only that array has a reference to the new object. The str. Although the two forms are functionally identical, the shorthand form is preferred and is used throughout this guide when referring to the type of an array. No further bridging is required when accessing elements of the Array instance. And at the end it becomes the result of reduce. It splits the string into an array by the given delimiter delim. Because this particular array has specified a value type of String, it is allowed to store String values only. During the registration period, you need to add and remove names as students add and drop the class. For more about generic types and collections, see Generics. When that happens, the array being modified replaces its storage with a uniquely owned copy of itself, which is then modified in place. Using a negative number or an index equal to or greater than count triggers a runtime error. The methods arr. If you assign an array, a set, or a dictionary to a constant, that collection is immutable, and its size and contents cannot be changed.

The easiest way to grasp that is by example. The first element of a nonempty array is always at index zero. During the registration period, you need to add and remove names as students add and drop the class.

The elements at that index and later indices are shifted back to make room.

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The largest valid index in an array is count - 1 because arrays are indexed from zero—however, when count is 0 meaning the array is emptythere are no valid indexes. In this case, the array literal contains two String values and nothing else.

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