Switch.swift

/// Switch statement helper to switch with function as input
func ~= <T>(value: T, block: (T) -> Bool) -> Bool {
    block(value)
}

func ~= <T0, T1>(value: (T0, T1), block: (T0, T1) -> Bool) -> Bool {
    block(value.0, value.1)
}

func ~= <T0, T1, T2>(value: (T0, T1, T2), block: (T0, T1, T2) -> Bool) -> Bool {
    block(value.0, value.1, value.2)
}

func ~= <T0, T1, T2, T3>(value: (T0, T1, T2, T3), block: (T0, T1, T2, T3) -> Bool) -> Bool {
    block(value.0, value.1, value.2, value.3)
}

Usage.swift

func isValidValue(_ value: String) -> Bool {
  // ...
}

switch isValidValue {
case "maybe this?": print("1")
case "what about this?": print("2")
case "or this?": print("3")
}