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Mastering Swift 4 - Fourth Edition by Jon Hoffman

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Subscripts with Swift arrays

The following example shows how to use subscripts to access and change the values of an array:

var arrayOne = [1, 2, 3, 4, 5, 6]  
print(arrayOne[3])  //Displays '4' 
arrayOne[3] = 10 
print(arrayOne[3])  //Displays '10' 

In the preceding example, we create an array of integers and then use the subscript syntax to display and change the element at index 3. Subscripts are mainly used to get or retrieve information from a collection. We generally do not use subscripts when specific logic needs to be applied to determine which item to select. As an example, we would not want to use subscripts to append an item to the end of the array or to retrieve the number of items in the array. To append an item to the end of an array ...

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