Slide 5
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For example, if you go down to a fast food joint and order a cheeseburger they
will immediately take your order and then make you wait around until the
cheeseburger is ready. In the meantime they can take other orders and start
cooking cheeseburgers for other people. Imagine if you had to wait at the register
for your cheeseburger, blocking all other people in line from ordering while they
cooked your burger! This is called blocking I/O because all I/O (cooking
cheeseburgers) happens one at a time. Node, on the other hand, is non-blocking,
which means it can cook many cheeseburgers at once.
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https://github.com/maxogden/art-of-node