Swift .filter()

The .filter() method takes an array and returns a new array with only elements that meet the condition stated in the filter. If none of the elements meet the condition stated in the filter, the method returns nil. The original, existing array is not affected by this method.

Syntax

arrayName.filter({$0 condition })

The .filter() method takes a single condition parameter. It is a closure that returns a boolean value indicating whether a given array element is a match.

In the example below, the .filter() method is used to search through the names array. All items that meet the condition of starting with A will be returned.

Example

var names = ["Ariel", "Jamsin", "Cinderella", "Aurora", "Belle", "Mulan", "Tiana", "Moana"]

// Return all elements that start with an "A"
var result = names.filter( {$0.hasPrefix("A")})

print(result)

Copy to clipboard
Copy to clipboard

This will output:

["Ariel", "Aurora"]

Copy to clipboard
Copy to clipboard