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in this video we are going to talk about arrows in the last video we have tackled category theory and structures such as functors applicatives and monads that provided us with the theoretical frameworks for our code arrows are another structure representing an abstract sense of computation specifically focusing on composition in essence they are a computation parameterized over the input and output so essentially arrows are very similar to simple functions but lifted into their own context why that is helpful we will see later arrows are all about composition so we need to master the building of new arrows from existing arrows all the needed classes that we need for this video are accessible after importing control dot arrow okay so when looking at the type class for arrows we see many functions but luckily the minimal definition only needs two of them the first one r is used in order to lift an ordinary function into the arrow context the other functions are used for composition so le