👉 A fluid in programming, particularly in functional programming languages like Haskell or Scala, is a type that can be converted between different forms, known as types, without changing its value. This conversion process is governed by specific rules that ensure type safety and consistency. Fluids can be thought of as "values" that can transform into other types, such as lists, vectors, or even more abstract structures, while preserving their identity and behavior. This mechanism allows for flexible and powerful data manipulation, enabling developers to write concise and expressive code by seamlessly converting between different data structures. For example, a list of integers can be fluidly converted into a vector or a set, each with its own unique properties and operations.
