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152. What is Generator and what is it useful for?
In short, a generator is a special type of function that can be paused and resumed during its execution, and allows generating a sequence of values.
It is useful for simplifying async code with the use of yield keyword, allowing for better control of asynchronous execution flow. It can also be used for lazy evaluation of sequences to optimize performance.
Generators are also often used in combination with Promises, allowing to implement a cooperative concurrency model.