Functional C# - insight by Python

Python has many powerful functions. I realized there are many similar functions available in .NET.

Enumerable.Aggregate

Function	Description	.NET
zip	Pairs iterables element by element: * x = [1, 2, 3] * y = [4, 5, 6] * zipped = zip(x, y) * zipped [(1, 4), (2, 5), (3, 6)]	Enumerable.Zip int[] numbers = { 1, 2, 3, 4 }; string[] words = { "one", "two", "three" }; var numbersAndWords = numbers.Zip(words, (first, second) => first + " " + second); foreach (var item in numbersAndWords) Console.WriteLine(item); // 1 one // 2 two // 3 three
reduce	Apply function of two arguments cumulatively to the items of iterable, from left to right, so as to reduce the iterable to a single value. For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates ((((1+2)+3)+4)+5) .	Enumerable.Aggregate string sentence = "the quick brown fox jumps over the lazy dog"; // Split the string into individual words. string[] words = sentence.Split(' '); // Prepend each word to the beginning of the // new sentence to reverse the word order. string reversed = words.Aggregate((workingSentence, next) => next + " " + workingSentence); // dog lazy the over jumps fox brown quick the
filter	Construct a list from those elements of iterable for which function returns true. filter(lambda x: x%2, range(10)) result: 1 3 5 7 9	Enumerable.Where List fruits = new List { "apple", "passionfruit", "banana", "mango", "orange", "blueberry", "grape", "strawberry" }; IEnumerable query = fruits.Where(fruit => fruit.Length < 6); /* This code produces the following output: apple mango grape */