How can I filter an array in SwiftUI using conditions with "and" or "or"?

Filtering an array in SwiftUI using conditions with "and" or "or" is straightforward using the filter method combined with logical operators. Here's how you can achieve this:

1. Basic Filtering with a Single Condition:

- Before diving into "and" and "or", let's start with a simple filter. Suppose you have an array of integers and you want to filter out numbers greater than 5:

let numbers = [1, 6, 2, 7, 3, 8, 4, 9, 5, 10]
let filteredNumbers = numbers.filter { $0 > 5 }
// filteredNumbers will be [6, 7, 8, 9, 10]

2. Filtering with "and" Conditions:

- To filter with "and" conditions, you combine multiple conditions using the && operator within the filter closure. For example, to filter numbers that are greater than 3 and less than 8:

let numbers = [1, 6, 2, 7, 3, 8, 4, 9, 5, 10]
let filteredNumbers = numbers.filter { $0 > 3 && $0 < 8 }
// filteredNumbers will be [6, 7, 4, 5]

3. Filtering with "or" Conditions:

- To filter with "or" conditions, you combine multiple conditions using the || operator within the filter closure. For example, to filter numbers that are less than 3 or greater than 8:

let numbers = [1, 6, 2, 7, 3, 8, 4, 9, 5, 10]
let filteredNumbers = numbers.filter { $0 < 3 || $0 > 8 }
// filteredNumbers will be [1, 2, 9, 10]

4. Filtering with Complex Conditions:

- You can combine "and" and "or" conditions to create more complex filters. Use parentheses to group conditions and ensure the correct order of operations. For example, to filter numbers that are either less than 3 or greater than 6 and less than 9:

let numbers = [1, 6, 2, 7, 3, 8, 4, 9, 5, 10]
let filteredNumbers = numbers.filter { $0 < 3 || ($0 > 6 && $0 < 9) }
// filteredNumbers will be [1, 2, 7, 8]

5. Filtering with Custom Objects:

- The same principles apply when filtering arrays of custom objects. Suppose you have a struct Person with properties name and age:

struct Person {
  let name: String
  let age: Int
}

let people = [
  Person(name: "Alice", age: 25),
  Person(name: "Bob", age: 30),
  Person(name: "Charlie", age: 22),
  Person(name: "David", age: 35)
]

let filteredPeople = people.filter { $0.age > 25 && $0.name.contains("B") }
// filteredPeople will be [Person(name: "Bob", age: 30)]

By using the filter method with logical operators, you can create powerful and flexible filtering logic in your SwiftUI applications. Remember to use parentheses to clarify complex conditions and ensure the correct order of operations.

Learn more about this