Continuations

2016-06-20

You have seen, especially in the Higher Order Function lecture, how we can use functions to generalize an operation. Continuations are another example of this. Many languages have a return keyword to tell the program to return from a function call with a certain result. What if you could replace that with a parameter of your own choosing? The result is called a continuation, and they have enormous power over the execution flow of a program.

These may well seem abstract to you, but you will recognize them if you ever program in languages like Javascript, where they are usually called “callbacks”.

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