SwiftGenericsExample.swift

// non-generic functions
func someFunctionInt(_ values: [Int]) {}
func someFunctionString(_ values: [String]) {}
// generic
func someFunction<T>(_ values: [T]) {}

// non-generic functions
someFunctionInt([1, 2, 3])
someFunctionString(["a", "b", "c"])
// generic
someFunction([1, 2, 3])
someFunction(["a", "b", "c"])

// Type constraint
func someSortFunction<T: Comparable>(_ values: [T]) -> [T] {
    return values.sorted()
}
let sorted = someSortFunction([3, 7, 5, 1])
print(sorted) // [1, 3, 5, 7]