HackerRank Functional Challenges HR F#: Lambda Calculus - Evaluating Expressions #5 Alex Netkachov Alex likes functional programming and algorithms. Apart from programming, his favourites are walking with his family in the parks and national trails and reading about universe and history. More posts by Alex Netkachov. Alex Netkachov 22 Sep 2017 • 1 min read This is even more simple than the previous one. Compute the value of λx.λy.y. The answer is 0. See the same Church numerals table.