Swift .isEmpty

The .isEmpty property returns true if an array contains no elements, and returns false if the array contains one or more elements.

Syntax

arrayName.isEmpty

Where arrayName is the array being checked for elements.

Example

The following example creates and array and evaluates the contents of the array with .isEmpty before and after adding an element:

var favoriteSongs = [String]()
print(favoriteSongs.isEmpty)

favoriteSongs.append("Stayin' Alive")
print(favoriteSongs.isEmpty)

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This will output:

true
false

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Note: Big-O of this method is O(1).