I have 2 types, A
and B
that implement the same methods and have the same properties on them. I have defined an extension to fetch a value in a sub property for each of A
and B
. I want to know if there is a way to reduce those 2 extensions down to 1 method. Imagine there are many more types like A
and B
so the code duplication problem becomes much worse.
Update: A
and B
are generated along with many others like them. The original plan is to avoid writing extensions at all for A
or B
. I don't know if this is possible but I was told I could use KeyPaths for this. The properties names must be different. This is a byproduct of the code generation
struct A {
var something: Common
}
struct B {
var somethingElse: Common
}
struct Common {
var value1: String
var value2: String
}
extension A {
func valueFor(condition: Bool) -> String {
return condition ? self.something.value1 : self.something.value2
}
}
extension B {
func valueFor(condition: Bool) -> String {
return condition ? self.somethingElse.value1 : self.somethingElse.value2
}
}
I think protocols are the solution for your problem. They help to make code more generic.
protocol CommonContaining {
var common: Common { get set }
func valueFor(condition: Bool) -> String {
return condition ? self.common.value1 : self.common.value2
}
}
struct A {
var something: Common
}
struct B {
var somethingElse: Common
}
extension A: CommonContaining {
var common: Common {
return something
}
}
extension B: CommonContaining {
var common: Common {
return somethingElse
}
}
From what i have understand, if the method is related to Common struct then you should implement this method in the struct itself or to create extension to the struct :
struct A
{
var something: Common
}
struct B
{
var somethingElse: Common
}
struct Common
{
var value1: String
var value2: String
func valueFor(condition: Bool) -> String {
return condition ? self.value1 : self.value2 }
}
var object_1 = A(something: Common(value1: "1", value2: "1"))
var object_2 = B(somethingElse: Common(value1: "1", value2: "2"))
print(object_1.something.valueFor(condition: true))
print(object_2.somethingElse.valueFor(condition: false))
Good luck.
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