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Laymans explanation of delimited continuations with examples of using them for exception handling and nondeterministic programming.
Delimited Continuations
Delimited continuations manipulate the control flow of programs. Similar to control structures like conditionals or loops they allow to deviate from a sequential flow of control.
We use exception handling as another example for control flow manipulation and later show how to implement it using delimited continuations. Finally, we show that nondeterminism can also be expressed using delimited continuations.
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Version 1.0, 1 Feb 2017: Intial specification.
Version 1.1, 2 Feb 2017: Integer encoding simplified. Appendix A added.
Version 1.2, 3 Feb 2017: Better specify the meaning of the num-elements
field with value of 65535. The two 12 bits
async/await is just the do-notation of the Promise monad
async/await is just the do-notation of the Promise monad
CertSimple just wrote a blog post arguing ES2017's async/await was the best thing to happen with JavaScript. I wholeheartedly agree.
In short, one of the (few?) good things about JavaScript used to be how well it handled asynchronous requests. This was mostly thanks to its Scheme-inherited implementation of functions and closures. That, though, was also one of its worst faults, because it led to the "callback hell", an seemingly unavoidable pattern that made highly asynchronous JS code almost unreadable. Many solutions attempted to solve that, but most failed. Promises almost did it, but failed too. Finally, async/await is here and, combined with Promises, it solves the problem for good. On this post, I'll explain why that is the case and trace a link between promises, async/await, the do-notation and monads.
First, let's illustrate the 3 styles by implementing
Automatically place signs based on the quickfix list.
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