map swift
// A map example which maps each item in this array of numbers
// to its value multiplied by 2.
let array = [1, 2, 3, 4]
// Full closure
print(array.map({ (num: Int) -> Int in return num * 2 }))
// Abbreviated trailing closure, with inferred arguments,
// argument type, and return type.
print(array.map { $0 * 2 })
// Output: [2, 4, 6, 8]swift array map example
swift 5
// taken from developer.apple.com map(_:)
let cast = ["Vivien", "Marlon", "Kim", "Karl"]
let lowercaseNames = cast.map { $0.lowercased() }
// 'lowercaseNames' == ["vivien", "marlon", "kim", "karl"]
let letterCounts = cast.map { $0.count }
// 'letterCounts' == [6, 6, 3, 4]Copyright © 2021 Codeinu
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