11Mastering Concurrent Processes with core.async


One day, while you are walking down the street, you will be surprised, intrigued, and a little disgusted to discover a hot dog vending machine. Your scalp tingling with guilty curiosity, you won’t be able to help yourself from pulling out three dollars and seeing if this contraption actually works. After accepting your money with a click and a whir, it pops out a fresh hot dog, bun and all.

The vending machine exhibits simple behavior: when it receives money, it releases a hot dog and then gets ready for the next purchase. When it’s out of hot dogs, it stops. All around us are hot dog vending machines ...

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