Use LINQ Aggregate to Multiply a Series of Digits
The LINQ Aggregate() extension method uses a Func<int, int, int> to operate on items in a series. If you want to use it, for example, to return the product of each value with its successor, you can do something like this:
Func<int, int, int> producter = (one, two) => one * two;
var result = subString.ToCharArray().ToDigits().Aggregate(producter);
Of course, you don’t need the intermediate value. You can simply use a lambda directly for the Aggregate()’s parameter:
//Func<int, int, int> producter = (one, two) => one * two;
var result = subString.ToCharArray().ToDigits().Aggregate((p1,p2) => p1 * p2);
With a loop to keep track of the largest result returned for a substring of length 5, you can easily use this technique to solve Euler 8.
Comments
MIke said on 06 Sep 2009 at 8:03 AM
I've found it useful for putting together comma separated lists as well.
var items = new string[] {"1", "2", "3"};
var csl = items.Aggregate((s1,s2) => s1 + "," + s2);
UGG Boots sale said on 28 Jan 2010 at 2:28 AM
var items = new string[] {"1", "2", "3"};
var csl = items.Aggregate((s1,s2) => s1 + "," + s2);
Life Insurance Quotes said on 02 Feb 2010 at 1:51 AM
including a Primes generator for previous Euler problems, the base case given in the problem can be reduced to this NUnit test: