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Created Mar 12, 2018
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public class CourseTests
public void PlayIncreaseViewers()
Func<int, int> doubleX = x => x*2;
var memoized = doubleX.Memoize();
var result = memoized(4);
var obj = memoized(1);
Assert.Equal(result, obj);
public static class MemoizeExtension
public static Func<A, R> Memoize<A, R>(this Func<A, R> f)
var cache = new ConcurrentDictionary<A, R>();
return a => cache.GetOrAdd(a, f);
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