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Difference between array, set and dictionary

Ans : 

Array :
Arrays are effectively ordered lists and are used to store lists of information in cases where order is important.
Cost of adding item in array is greater than set and dictionary if item is not appending first.

For example, posts in a social network app being displayed in a tableView may be stored in an array.

Set : 
Sets are different in the sense that order does not matter and these will be used in cases where order does not matter. Sets are especially useful when you need to ensure that an item only appears once in the set.

Dictionary : 
Dictionaries are used to store key, value pairs and are used when you want to easily find a value using a key, just like in a dictionary.


For example, you could store a list of items and links to more information about these items in a dictionary.


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