extension swift
// A basic class
class MyClass {
private let a = 5
func getA() -> Int {
return self.a
}
}
// An extension of that class - adds a function
extension MyClass {
// Add an amount to the value of `a`
func add(_ amount: Int) -> Int {
// self can be used to access MyClass' members
return self.getA() + amount
}
}
var mc = MyClass()
print(mc.getA()) // Direct member of the class (Output: 5)
// Function from extension - called as if the function
// was in the original definition. (Output: 10)
print(mc.add(5))