Finding the last index of an array

Question

How do you retrieve the last element of an array in C

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With C  8   int   array     1  3  5    var lastItem   array  1      5

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Use Array GetUpperBound 0   Array Length contains the number of items in the array  so reading Length -1 only works on the assumption that the array is zero based

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say your array is called arr  do   arr arr Length - 1

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New in C  8 0 you can use the so-called  quot hat quot      operator  This is useful for when you want to do something in one line  var mystr    quot Hello World  quot   var lastword   mystr Split  quot   quot    1   Console WriteLine lastword      World   instead of the old way  var mystr    quot Hello World quot   var split   mystr Split  quot   quot    var lastword   split split Length - 1   Console WriteLine lastword      World   It doesn t save much space  but it looks much clearer  maybe I only think this because I came from python    This is also much better than calling a method like  Last   or  Reverse   Read more at MSDN Edit  You can add this functionality to your class like so  public class MyClass     public object this Index indx          get                Do indexing here  this is just an example of the  IsFromEnd property       if  indx IsFromEnd                  Console WriteLine  quot Negative Index  quot                 else                 Console WriteLine  quot Positive Index  quot                        The Index IsFromEnd will tell you if someone is using the  hat      operator

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Is this worth mentioning   var item   new Stack arr  Pop

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LINQ provides Last     csharp gt  int   nums    1 2 3 4 5   csharp gt  nums Last                  5   This is handy when you don t want to make a variable unnecessarily   string lastName    Abraham Lincoln  Split   Last

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The array has a Length property that will give you the length of the array  Since the array indices are zero-based  the last item will be at Length - 1   string   items   GetAllItems    string lastItem   items items Length - 1   int arrayLength   array Length    When declaring an array in C   the number you give is the length of the array   string   items   new string 5      five items  index ranging from 0 to 4

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To compute the index of the last item   int index   array Length - 1    Will get you -1 if the array is empty - you should treat it as a special case   To access the last index   array array Length - 1          or        array array Length - 1    will cause an exception if the array is actually empty  Length is 0

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The following will return NULL if the array is empty  else the last element   var item    arr Length    0    null   arr arr Length - 1

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Array starts from index 0 and ends at n-1  static void Main string   args        int   arr     1  2  3  4  5        int length   arr Length - 1       starts from 0 to n-1      Console WriteLine length          this will give the last index      Console Read

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Also  starting with  NET Core 3 0  and  NET Standard 2 1   C  8  you can use Index type to keep array s indexes from end   var lastElementIndexInAnyArraySize    1  var lastElement   array lastElementIndexInAnyArraySize     You can use this index to get last array value in any lenght of array  For example   var firstArray   new    0  1  1  2  2   var secondArray   new    3  3  4  4  5  5  5  5  5  5  5  5  5   var index    1  var firstArrayLastValue   firstArray index      2 var secondArrayLastValue   secondArray index      5   For more information check documentation

[c#] Finding the last index of an array

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