This post abstracts handling async tasks and come up with declarative linearized API model. Async tasks includes nested networking, nested animation and even nested multi-threading compute intensive code blocks. Async task is one of side effect programming technique. Side effect is integral part of programming; mutating state, printing to screen/paper, asynctask to download JSON, keeping a running counter, locking/unlocking thread are all examples of side effect programming technique. Any useful programming language must provide a way to interact with side effects.
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