Generic Collections - Swift Programming

Arrays are generic collections, so helper functions can preserve the element type they receive.

Work with element type

generic_collections.swift

func repeated<T>(_ value: T, count: Int) -> [T] {
    var output: [T] = []
    for _ in 0..<count {
        output.append(value)
    }
    return output
}

let repeatCount = 
let values = repeated("go", count: repeatCount)
let summary = values.joined(separator: ",")

print(summary)

func repeated<T>(_ value: T, count: Int) -> [T] {
    var output: [T] = []
    for _ in 0..<count {
        output.append(value)
    }
    return output
}

let repeatCount = 
let values = repeated("go", count: repeatCount)
let summary = values.joined(separator: ",")

print(summary)

func repeated<T>(_ value: T, count: Int) -> [T] {
    var output: [T] = []
    for _ in 0..<count {
        output.append(value)
    }
    return output
}

let repeatCount = 
let values = repeated("go", count: repeatCount)
let summary = values.joined(separator: ",")

print(summary)

generic collection Generic collection helpers describe a relationship between the element type and the returned value.