How to use swift functional programming

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Example / Statistical word frequency let non_words: Set = ["the", "and", "of", "to", "a", "I", "it", "in", "or", "is", "as", "so", "but", "be" "don't"] / / conventional func wordFreq (words: String)-> [Dictionary] {var wordDict: [String: Int] = [:] let wordList = words.split (separator: ") for word in wordList {let lowerCaseWord = word.lowercased () if! non_words.contains (lowerCaseWord) {if let count = wordDict [lowerCaseWord] {wordDict [ LowerCaseWord] = count + 1} else {wordDict [lowerCaseWord] = 1}} var sortedResult = [Dictionary] () for item in wordDict.sorted {$0.1 > $1.1} {sortedResult.append ([item.key: item.value])} return sortedResult} let words = "" The powerful programming language that is also easy to learn Swift is a powerful and Intuitive programming language for macOS iOS watchOS tvOS and beyond Writing Swift code is interactive and fun the syntax is concise yet expressive and Swift includes modern features developers love Swift code is safe by design yet also produces software that runs lightning-fast Swift is the result of the latest research on programming languages combined with decades of experience building Apple platforms Named parameters are expressed in a clean syntax that makes APIs "" let ret = wordFreq (words: words) print (ret) / / ["swift": 5] ["programming": 3], ["that": 3], ["syntax": 2], ["code": 2], ["yet": 2], ["powerful": 2], ["also": 2], ["language": 2], ["beyond": 1], ["clean": 1], ["result": 1], ["features": 1], ["on": 1], ["produces": 1] ["concise": 1], ["latest": 1], ["developers": 1], ["for": 1], ["design": 1], ["experience": 1], ["with": 1], [parameters ": 1], [" building ": 1], [" macos ": 1], [" combined ": 1], [" languages ": 1], [" lightning-fast ": 1], [" tvos ": 1] ["interactive": 1], ["safe": 1], ["fun": 1], ["apis": 1], ["easy": 1], ["decades": 1], ["makes": 1], [by ": 1], [" includes ": 1], [" expressed ": 1], [" love ": 1], [" are ": 1], [" intuitive ": 1], [" named ": 1] ["research": 1], ["writing": 1], ["watchos": 1], ["expressive": 1], ["apple": 1], ["platforms": 1], ["learn": 1], ["ios": 1], ["software": 1], ["modern": 1] ["runs": 1]] / / functional programming func wordFreqTwo (words: String)-> [Dictionary] {var wordDict: [String: Int] = [:] words.split (separator: ") .map {$0.lowercased ()} .filter {! non_words.contains ($0)} .forEach {(word) in wordDict [word] = (wordDict [word) ]? 0) + 1} var sortedResult = [Dictionary] () wordDict.sorted {(word) in sortedResult.append ([word.key: word.value])} return sortedResult} let retTwo = wordFreqTwo (words: words) print (retTwo) / / ["swift": 5] ["programming": 3], ["that": 3], ["syntax": 2], ["also": 2], ["language": 2], ["powerful": 2], ["yet": 2], ["code": 2], ["love": 1], ["safe": 1], ["watchos": 1], ["ios": 1], ["combined": 1], ["tvos": 1] ["runs": 1], ["are": 1], ["experience": 1], ["design": 1], ["by": 1], ["expressed": 1], ["features": 1], [result ": 1], [" parameters ": 1], [" expressive ": 1], [" building ": 1], [" fun ": 1], [" software ": 1], [" on ": 1] ["research": 1], ["writing": 1], ["produces": 1], ["with": 1], ["clean": 1], ["platforms": 1], ["named": 1], [concise ": 1], [" latest ": 1], [" makes ": 1], [" interactive ": 1], [" languages ": 1], [" easy ": 1], [" for ": 1] ["lightning-fast": 1], ["beyond": 1], ["decades": 1], ["apis": 1], ["learn": 1], ["includes": 1], ["modern": 1], ["macos": 1], ["intuitive": 1], ["developers": 1]] so far I believe you have a deeper understanding of "how to use swift functional programming". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!