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Swift Functional Programming - Second Edition by Dr. Fatih Nayebi

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The map function

The map function is a higher-order function that solves the problem of transforming the elements of an array using a function. Consider the following example:

let numbers = [10, 30, 91, 50, 100, 39, 74] var formattedNumbers: [String] = [] for number in numbers {     let formattedNumber = "\(number)$"     formattedNumbers.append(formattedNumber) } let mappedNumbers = numbers.map{ "\($0)$" } 

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