@online{keles2023learners,
  author = {Alperen Keles},
  title = {Learner’s Guide to Functional Programming#0: Sum Types, Booleans and Naturals in Javascript},
  year = {2023},
  url = {https://alperenkeles.com/posts/learners-guide-to-functional-programming0-sum-types-booleans-and-naturals-in-javascript/},
  note = {Archived at \url{https://web.archive.org/web/https://alperenkeles.com/posts/learners-guide-to-functional-programming0-sum-types-booleans-and-naturals-in-javascript/}}
}