Information Technology Tips

I have written Dictionary which returns default value if the key is missing in the dictionary. You simply pass lambda function for returning value when the key is missing in Dictionary to its constructor. using System; using System.Collections.Generic; namespace Utility.Data { public class DefaultDictionary<TKey, TValue> : Dictionary<TKey, TValue> { private readonly Func<TKey, TValue> defaulter; public DefaultDictionary(Func<TKey, TValue> defaulter) { this.defaulter = defaulter; } public TValue GetDefaultValueIfMissing(TKey key){ if (ContainsKey(key)) { return this[key]; } return defaulter(key); } } } This is how to use.... var dict = new DefaultDictionary<string, IList<string>>((key) => new List<string>()); // should return empty list var list = dict.GetDefaultValueIfMissing("key1...

public class DictionaryUtils { public function DictionaryUtils() { } public static function forEachBySortedValue(dict:Dictionary, compare:Function, callback:Function):void { var v:Vector.<Object> = extractValues(dict); v.sort(compare); for each(var value:Object in v) { callback(value); } } public static function forEachBySortedKey(dict:Dictionary, compare:Function, callback:Function):void { var v:Vector.<Object> = extractKeys(dict); v.sort(compare); for each(var key:Object in v) { callback(key, dict[key]); } } public static function extractValues(dict:Dictionary):Vector.<Object> { var v:Vector.<Object> = new Vector.<Object>(); for each(var value:Object in dict) { v.push(value); } return v; } public static function extractKeys(dict:Dictionary):Vector.<Object> { var v:Vector.<Object> = new Vector.<Object>(); for (var key:Object in dict) { v.push(key); } return v; } pu...