public static void TestLabelTree()
{
var labelTree = new LabelTree(
"Animals",
List(
new LabelTree(
"Birds",
List(new LabelTree("Crow"), new LabelTree("Eagle"))
),
new LabelTree(
"Mammals",
List(new LabelTree("Dog"), new LabelTree("Cat"))
)
)
);
var germanDictionary = new System.Collections.Generic.Dictionary <string, string>
{
["Animals"] = "Tiere",
["Birds"] = "Vögel",
["Mammals"] = "Säugetiere",
["Crow"] = "Krähe",
["Eagle"] = "Adler",
["Dog"] = "Hund",
["Cat"] = "Katze"
};
var actual = labelTree.Map(l => germanDictionary[l]);
var expected = new LabelTree(
"Tiere",
List(
new LabelTree(
"Vögel",
List(new LabelTree("Krähe"), new LabelTree("Adler"))
),
new LabelTree(
"Säugetiere",
List(new LabelTree("Hund"), new LabelTree("Katze"))
)
)
);
Assert.AreEqual(expected, actual);
}
public static LabelTree <R> Map <T, R>(this LabelTree <T> @this, Func <T, R> f) => new LabelTree <R>(f(@this.Label), @this.Children.Map(tree => tree.Map(f)));
// Imagine you need to add localization to your navigation tree: you're given a `LabelTree` where
// the value of each label is a key, and a dictionary that maps keys
// to translations in one of the languages that your site must support
// (hint: define `Map` for `LabelTree` and use it to obtain the localized navigation/category tree)
static LabelTree Map(this LabelTree tree, Func <string, string> f)
=> new LabelTree(f(tree.Label), tree.Subtrees.Map(t => t.Map(f)));
