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annotate Arrays.cs @ 0:961030992bd2

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Initial commit of IBBoard libraries
author IBBoard <dev@ibboard.co.uk>
date Fri, 19 Dec 2008 11:13:48 +0000
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children 0352fa33ee8f
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961030992bd2 Initial commit of IBBoard libraries
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1 using System;
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2 using System.Collections;
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3
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4 namespace IBBoard
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5 {
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6 /// <summary>
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7 /// Summary description for Arrays.
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8 /// </summary>
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9 public class Arrays
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10 {
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11 public static object[] Subtract(object[] items, object[] subtract)
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12 {
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13 ArrayList arr = new ArrayList();
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14 arr.AddRange(items);
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15
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16 foreach (object obj in subtract)
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17 {
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18 arr.Remove(obj);
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19 }
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20
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21 return arr.ToArray();
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22 }
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23
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24 public static object[] Difference(object[] items1, object[] items2)
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25 {
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26 ArrayList arr = new ArrayList();
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27
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28
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29 //Difference with as few loops as possible, so see which is shortest
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30 if (items1.Length > items2.Length)
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31 {
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32 //add everything from the first list
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33 arr.AddRange(items1);
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34
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35 foreach (object obj in items2)
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36 {
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37 //Then for each item in the second list, if it is in the list remove it
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38 if (arr.Contains(obj))
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39 {
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40 arr.Remove(obj);
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41 }
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42 else
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43 {
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44 //and if it isn't in the list add it
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45 arr.Add(obj);
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46 }
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47 }
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48 }
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49 else
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50 {
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51 //add everything from the second list
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52 arr.AddRange(items2);
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53
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54 foreach (object obj in items1)
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55 {
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56 //Then for each item in the first list, if it is in the list remove it
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57 if (arr.Contains(obj))
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58 {
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59 arr.Remove(obj);
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60 }
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61 else
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62 {
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63 //and if it isn't in the list add it
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64 arr.Add(obj);
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65 }
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66 }
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67 }
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68
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69 return arr.ToArray();
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70 }
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71
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72 public static int IndexOf(object[] items, object item)
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73 {
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74 for (int i = 0; i<items.Length; i++)
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75 {
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76 if (items[i].Equals(item))
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77 {
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78 return i;
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79 }
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80 }
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81
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82 return -1;
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83 }
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84
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85 public static bool Contains(object[] items, object item)
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86 {
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87 return IndexOf(items, item) != -1;
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88 }
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89 }
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90 }