Quickly check if an array contains a certain element.

ArrayContains.swift

class Person {
    let name: String
    var age: Int
    
    init(name: String, age: Int) {
        self.name = name
        self.age = age
    }
}

let people = [Person(name: "Saoud", age: 19), Person(name: "Gus", age: 20), Person(name: "Jake", age: 21)]

if people.contains(where: { $0.age == 21 }) {
    print("Let's party tonight")
}