In functional programming, we rarely worry about concurrency primitives like threads. Instead, we use abstractions to make our code easier to reason about. In JavaScript, a Promise is the most common abstraction we encounter. It is usually associated with an Ajax request. We often use abstractions to reason about our concurrent code, but those abstractions can apply in other situations, as well. High level user interactions are essentially large asynchronous events, and can be represented as such in code.
Example: A video storefront
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