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Okay, diving into asynchronous JavaScript – I remember this being a tough one when I started! Good to see him breaking it down from callbacks all the way to async/await, setting the stage nicely.

Ah, `addEventListener`! That's such a classic example of a callback. Passing a function to be executed later is the core idea, and it's great he’s showing practical use cases right away.

Using `fs.readFile` with an error-first callback is a really solid demonstration. It’s crucial to handle those potential errors upfront, and seeing that pattern laid out clearly is helpful for understanding the fundamentals.

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The speaker begins by introducing asynchronous JavaScript as a challenging but crucial concept, outlining the progression from callbacks to promises and finally async/await [0:00-0:30]. He illustrates callbacks with an `addEventListener` example, highlighting how a function is passed as an argument to be executed later [0:30]. This pattern is further demonstrated with `fs.readFile`, where an error-first callback is used to handle potential issues during file reading, first checking for an error and then processing the data if successful [1:00-1:30].

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