Towards λ-calculus
For those who want to grok lambda calculus, I would highly recommend "An Introduction to Functional Programming Through Lambda Calculus" book by Greg Michaelson[0]. After going through the book, I could say that you're brain will adapt the functional programming paradigm if you are used to the imperative programming language. Functional programming will change the way you think and make you a better programmer.[0] - https://pdfs.semanticscholar.org/d986/546bc3780db3a3c0f8d88b...