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| medium.com/@sorenlind/three-ways-to-enumerate-the-words-in-a-string-using-swift-7da5504f0062 | |
| extension String { | |
| func words() -> [String] { | |
| let range = self.startIndex..<self.endIndex | |
| var words = [String]() | |
| self.enumerateSubstrings(in: range, options: NSString.EnumerationOptions.byWords) { (substring, _, _, _) -> () in | |
| words.append(substring ?? "") | |
| } | |
| return words | |
| } | |
| } | |
| func mostCommonWord(bannedWords: [String], paragraph: String) -> String { | |
| let hashset = Set(bannedWords) | |
| var hashmap = [String:Int]() | |
| let cleanString = Array(paragraph.lowercased().words()) | |
| print(cleanString) | |
| for word in cleanString { | |
| if !hashset.contains(word) { | |
| if let val = hashmap[word] { | |
| hashmap[word] = val + 1 | |
| } else { | |
| hashmap[word] = 1 | |
| } | |
| } | |
| } | |
| var result = "" | |
| for key in hashmap.keys { | |
| if result == "" || hashmap[key]! > hashmap[result]! { | |
| result = key | |
| } | |
| } | |
| return result | |
| } | |
| let word = mostCommonWord(bannedWords: ["hit"], paragraph: "Bob hit a ball, the hit BALL flew far after it was hit.") | |
| print(word) |
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