Writing JavaScript games in Haskell
Hi, welcome to the 6th article of this blog. In this blog post, the breakout example from the last Post has been improved, giving it more features: The Paddle and Blocks have rounded edges. The ball bounces of them depending on the surface normal where it hits. The blocks are fading out when destroyed. The paddle can shot to destroy blocks. When the game starts one shot is available, shots can be
doの乱用 - www.kotha.netの裏
メモ。 Haskell Reportによれば、(do a)という式の意味は(a)と同じなので、aがモナドな型を持っている必要はない。これを利用して、括弧を減らすためだけにdoを使うことができる。 import Data.Complex import Data.Monoid import Data.Text.Lazy.Builder import Data.Text.Lazy.Builder.RealFloat -- | 普通 complexInPolar :: Complex Double -> Builder complexInPolar x = fromString "(" <> realFloat (magnitude x) <> fromString ":" <> realFloat (phase x) <> fromString ")" -- | doの乱用 complexInP
Chapter 21. Using Databases
Everything from web forums to podcatchers or even backup programs frequently use databases for persistent storage. SQL-based databases are often quite convenient: they are fast, can scale from tiny to massive sizes, can operate over the network, often help handle locking and transactions, and can even provide failover and redundancy improvements for applications. Databases come in many different s
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