NSPredicate+Examples.swift

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

struct Payment {
    let currency: String
    let amount: Double
}

// persons named John older than 18
let predicate1 = \Person.name == "John" && \Person.age >= 18

// payments in EUR, USD or GBP greater than 1000
let predicate2 = \Payment.currency === ["EUR", "USD", "GBP"] && \Payment.amount > 1000

// doesn't compile - value type does not match
let predicate3 = \Payment.currency == 1000

// doesn't compile - root type between predicates does not match
let predicate4 = \Payment.currency == "EUR" && \Person.age >= 30