Writing code in an async programming framework like node.js becomes super complex and unbearably ugly super fast. You are dealing with synchronous and asynchronous functions and mixing them together can get really tricky. That is why we have Control Flow.
Basically, control flow libraries allow you to write non-blocking code that executes in an asynchronous fashion without writing too much glue or plumbing code. There is a wholesection on control-flow modules to help you unwind the sphagetti of callbacks that you will quickly land yourself into while dealing with async calls in node.js.
Control flow as a pattern can been implemented via several approaches and one of such approaches is called Promises.
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