public void Deconstruct_Returns_Item_And_Index()
{
var indexedItem = new ItemWithIndex <int>(42, 5);
var(item, index) = indexedItem;
item.Should().Be(42);
index.Should().Be(5);
}
static string ConvertLetter(ItemWithIndex <string> s)
{
if (s.Item == ".")
{
return("_");
}
if (s.Item.ToLower() == s.Item)
{
return(s.Item);
}
if (s.Index != 0)
{
return("_" + s.Item.ToLower());
}
return(s.Item.ToLower());
}
public static ItemWithIndex <T>?BinarySearch <T>(this IList <T> collection, Func <ItemWithIndex <T>, int> getDirection)
{
var left = 0;
var right = collection.Count - 1;
var mid = 0;
while (left < right)
{
mid = (left + right) / 2;
var item = collection[mid];
var point = new ItemWithIndex <T>
{
Item = item,
Index = mid,
};
var direction = getDirection(point);
if (direction > 0)
{
left = mid + 1;
}
else if (direction == 0)
{
return(point);
}
else
{
right = mid;
}
}
if (mid == left)
{
return(null);
}
var lastPoint = new ItemWithIndex <T>
{
Item = collection[left],
Index = left,
};
return(getDirection(lastPoint) == 0 ? lastPoint : (ItemWithIndex <T>?)null);
}
static bool HaveSameIndexAndItem <T>(ItemWithIndex <T> x, ItemWithIndex <T> y)
{
return(x.Index == y.Index && EqualityComparer <T> .Default.Equals(x.Item, y.Item));
}
