提升JavaScript生产力的“异样”编程手段.pdfVIP

JavaScript “” - 2011.7 • / / Jeffrey Zhao / • • http://blog.zhaojie.me/ • @ • F#, JavaScript, Scala, C#, Python, .NET, Mono... • Java // C# Liststring keywords = ...; var result = keywords .GroupBy(k = k[0].ToUpper()) .ToDictionary( g = g.Key, g = g.OrderBy(k = k).ToList()); // F# let keywords = ... let result = keywords | Seq.groupBy (fun k - k.[0].ToUpper()) | Seq.map (fun (k, v) - (k, v | Seq.sort)) | Map.ofSeq # Ruby keywords = ... result = keywords \ .group_by { |k| k[0,1].upcase } \ .each { |key, value| value.sort! } // JavaScript var keywords = ...; var result = keywords .groupBy(function (k) { return k[0].toUpperCase(); }) .each(function (key, value) { value.sort(); }); Java ListString keywords = ...; MapCharacter, ListString result = new HashMap...(); for (String k: keywords) { char firstChar = k.charAt(0); if (!result.containsKey(firstChar)) { result.put(firstChar, new ArrayListString()); } result.get(firstChar).add(k); } for (ListString list: result.values()) { Collections.sort(list); } * MapCharacter, ListString result = keyword .groupBy( new FString, Character { public Character f(String s) { return s.charAt(0); } }) .toMap( new FGroupingCharacter, String, Character { public Charactor f(GroupingChar, String g) { return g.getKey(); } }, new FGroupingCharacter, String, ListString { public ListString f(GroupingCharacter, String g) { return g