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Check my new app My WishingWall
October 31, 2012My check null
December 20, 2011There are many solutions on the net for avoiding the null check. Here is mine:
public interface Option<T> { }
public struct Nothing<T> : Option<T> { }
public struct Just<T> : Option<T>
{
public readonly T Value;
public Just(T value) { Value = value; }
}
public static class OptionExtentions
{
public static Option<T> ToOption<T>(this T value)
{
return (value == null)
? new Nothing<T>() as Option<T>
: new Just<T>(value);
}
public static U Select<T, U>(this Option<T> option,
Func<T, U> func)
{
return option.Select(func, () => default(U));
}
public static U Select<T, U>(this Option<T> option,
Func<T, U> whereJust, Func<U> whereNothing)
{
return option is Just<T>
? whereJust(((Just<T>)option).Value)
: whereNothing();
}
}
And implementation:
return (from h in HttpContext.Current.ToOption()
select h.User);
Sitecore Template Descendants Query
November 11, 2011I needed a query at Sitecore to select the descendants belonging to a template, of the ancestor belonging to another template
query:./ancestor::*[@@templatekey='templ 1']//*[@@templatekey='templ 2']
VS 2010 Dark Theme
August 20, 2011Visual Studio 2010 Dark Theme TextMate style, with ReSharper and Razor support.
Patterns and idioms in functional languages
June 15, 2011General reference in fp patterns and idioms.
Category Theory for the Java Programmer
June 13, 2011Very good presentation of Category Theory for Java.
