Implementing if without using if in Swift

SwiftIf.swift

func i(_ condition: Bool, then: () -> ()) -> (() -> ()) -> () {
    func run(_ condition: Bool) -> (() -> ()) -> () {
        return { _ = condition && $0() as Any is () }
    }
    run(condition)(then)
    return run(!condition)
}

// Usage:
let els = i(true) {
    print("a")
}
els {
    print("b")
}

i(true) {
    // true
} ( {
    // false
} )

(i(false) {
    // true
} ) {
    // false
}