Archive of posts with tag “ruby”
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An 🎃 easy 👻 but 🍬 spooky 💀 Ruby challenge
“It’s the weekend and you’ve just completed a seance with friends. After communing with the dead, you realize a mysterious message was left behind.” What is the decoded message? Use your Ruby skills to find out! -
The distribution when indistinguishable balls are put into boxes
Suppose there are distinguishable boxes and indistinguishable balls. Now, we randomly put the balls into the boxes. For each of the boxes, what is the probability that it contains balls? This is a simple combanitorics problem that can be solved by the stars and bars method. It turns out that in the limit with fixed, the distribution tends to be a geometric distribution. -
Labeled
break,next, andredoin Ruby
Many languages support breaking out of nested loops, such as Perl, Java, JavaScript, C#, etc. Languages that have gotocan also do this easily. However, in most other languages, it is not easy to break out of nested loops. I want to introduce a way to do this in Ruby. -
I made this, for the number of days in a week is prime
The number of days in a week is prime, so we cannot utilize weekly periods to help us remember periodical events unless the period is a multiple of 7. However, there may be something that we need to get reminded of which happens once per two days or three days. For example, I wash my hair once per two days and wash my clothes once per eight days. To solve the problem, I wrote a Ruby program to help remind me of those routines. -
Typesetting math in emails
After some comparison among solutions, I use KaTeX to typeset math in my emails. -
Simulating a mechanical system using RGSS3
Hamiltonian mechanics gives us a good way to simulate mechanical systems as long as we can get its Hamiltonian and its initial conditions. I implemented this simulation in RGSS3, the game scripting system shipped with RPG Maker VX Ace. -
Writing a DSL with commands split by space
DSL means domain-specific language. Ruby is a powerful script language in terms of building DSLs (as sublanguages of Ruby). In this article, I implemented my idea of a DSL with commands split by space. For example, you may just write a b cto run the commandsa,b, andcone after another! This trick is heavily applied in my project alda-rb. How do I achieve this? -
The structure of a basic RM game
In this article, I present minimal examples of a RM game. They only illustrate the basic concepts of how a RM game is structured and what is the running logic of it. -
Monkey-patching graciously
Monkey-patching is a powerful tool in programming. In this article, I used techniques of Ruby metaprogramming to define a series of methods def_after,def_before, etc. to help monkey-patching. They look graciously in that we can use it to shorten the codes for monkey-patching (avoiding aliasing and repeating codes).
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