CHAMPTUTORIAL

CHAMPION KAY TUTORIAL

Csharp Challenge 2

Posted by champtutorial On Thursday, 8 September 2011 0 comments

I've been playing around with linq-like functionality as a code kata the last few days. I've simplified the my Where method and made a simple skip and take function. I can now do this without the actual linq namespace:

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var results = list
    .Skip(2)
    .Take(200)
    .Where(x => x % 2 == 0);


My Skip method:

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public static IEnumerable<T> Skip<T>(
    this IEnumerable<T> list, int count)
{
    var enumerator = list.GetEnumerator();
    for (var i = 0; i < count; i++)
        enumerator.MoveNext();
 
    while (enumerator.MoveNext())
        yield return enumerator.Current;
}


My Take method:

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public static IEnumerable<T> Take<T>(
        this IEnumerable<T> list, int count)
{
    var enumerator = list.GetEnumerator();
    enumerator.MoveNext();
    for (var i = 0; i < count; i++)
    {
        yield return enumerator.Current;
        enumerator.MoveNext();
    }
}


My Where method:

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public static IEnumerable<T> Where<T>(
    this IEnumerable<T> list, Predicate<T> expression)
{
    foreach(var item in list)
        if(expression(item))
            yield return item;
}
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