Functional Extensions for C#


public static TResult Map<TSource, TResult>(
	this TSource @this,
	Func<TSource, TResult> fn) => fn(@this);


public static TResult Tee<t>(
	this T @this,
	Action<T> fn) => fn(@this)
		return @this;

Partial Function Application

public static Func<int, int> Add(int x) => y => x + y;
new[] {1, 2, 3}.Select(Add(1))

More stuff like this in Dave Fancher PluralSight course Functional Programming with C#

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