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How to remove items from an array using filter()

Swift version: 5.1

Paul Hudson    @twostraws   

The filter() method goes over all the items in an array (or indeed any kind of collection), and returns a new array containing items that pass a test you specify.

For example, given the following array:

let numbers = [1, 2, 4, 7, 9, 12, 13]

We could use filter() to create an array of all the numbers that are greater than or equal to 5:

let over5 = numbers.filter { $0 >= 5 }

Alternatively, you could use filter() to find odd numbers using modulus:

let odd = numbers.filter { $0 % 2 == 1 }
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