Parse a nested parentheses Objective Mimic Haskell's reads :: ReadS (). Or in other words, parse a nested parentheses. Valid Input "Nested parentheses" means (), (()), ((())), and so on. But there's a twist. The parser must munch also leading or intercalated whitespaces. So for example, the follo...

Introduction Logic gates! Everyone knows them, everyone loves them (unless you're starting to learn them). Take two booleans, compare them, get a single boolean in return. AND, NAND, OR, NOR, XOR, XNOR. Fun! But, what if you only had the inputs and output, but not the operator? Challenge Given a...

Challenge Unlike the circumference of a circle (which is as simple as \$2\pi r\$), the circumference of an ellipse is hard. Given the semi-major axis \$a\$ and semi-minor axis \$b\$ of an ellipse (see the image below, from Wikipedia), calculate its circumference. By definition, you can assume \$0 <...

Here is your task - Write a program to write the current year (as of writing 2020) as a seven segment display. For example, for the year 2020 would be displayed as: ---- ---- ---- ---- | | | | | | ---- | | ---- | | | | | | | | ---- ---- ---- ---- Conditions of code You may use...

Deserializing binary trees depth-first is pretty, but doing it breadth-first is (hopefully) harder. Your mission, should you choose to accept it, is to do the latter. The input will be a 1-D list of positive integers representing node values and some other consistent value representing the absenc...

Should I hold how much an answer's score increased/decreased (depending on the winning criterion) as an indicator of how good it is and whether or not I should upvote it? I used to see answers golfed by a hundred bytes as better than others even if they were longer because it seemed they were wor...

Code Golf's third moderator election has come to a close, the votes have been tallied and the three new moderators are: They'll be joining the existing crew shortly—please thank them for volunteering, and share your assistance and advice with them as they learn the ropes! For details on how th...

Introduction Just on Hacker news, John Resig contemplates transforming a query “foo=1&foo=2&foo=3&blah=a&blah=b” into one that looks like this: “foo=1,2,3&blah=a,b", https://johnresig.com/blog/search-and-dont-replace/. He claims "being 10 lines shorter than Mark’s solution". Query strings consist...

Parse a Scala expression code-golf Scala isn't a very commonly used language around here. Most of those who know it like it[citation needed], but some think :\ when they encounter its user-defined operators, saying they're too complicated. However, they're governed by a very simple set of rules, ...