Answer:
- Generic is a feature of Swift which helps to write Generalized / Reusable datatypes and methods.
- Generic is a feature of Swift which helps to write generalized programming.
- A Datatype which is capable of holding different types of values. Generic Datatype is not specific to Particular Datatype Values.
Answer:
- A method which is capable of performing operations on different datatype values.
/** Before Refacotoring, Stack can only contain 'Int' **/
class Stack {
var collection: [Int] = []
func push(item: Int) {
collection.append(item)
}
func pop() {
collection.removeLast()
}
func display() {
print(collection)
}
}
var intStack: Stack = Stack()
intStack.push(item: 10)/** After Refactoring, Stack can hold multiple types **/
class Stack<T> {
var collection: [T] = []
func push(item: T) {
collection.append(item)
}
func pop() {
collection.removeLast()
}
func display() {
print(collection)
}
}
var intStack: Stack<Int> = Stack()
intStack.push(item: 10)
let stringStack: Stack<String> = Stack()
stringStack.push(item: "Hello")Answer:
- Generic follows Swift’s Type Safety
- Any doesn’t follow type safety and you need to type check every time you perform an operation.
/** After Refactoring, Stack can hold multiple types **/
class Stack {
var collection: [Any] = []
func push(item: Any) {
collection.append(item)
}
func pop() {
collection.removeLast()
}
func display() {
print(collection)
}
func sum() {
var sum: Int = 0
for item in collection {
sum = sum + Int(item) // Casting is needed..
}
print(sum)
}
}
var intStack: Stack<Int> = Stack()
intStack.push(item: 10)
intStack.push(item: 20)
intStack.sum() // 30Answer:
- Generic avoids writing duplicate code while achieving Swift’s Type Safety Feature.
Section 3, Conditional Statement
Section 10, static type vs dynamic type
Section 12, generic
Section 15, higher order function