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What the heck is the event loop anyway?

JavaScript programmers like to use words like, “event-loop”, “non-blocking”, “callback”, “asynchronous”, “single-threaded” and “concurrency”. You nod and agree, as if it’s all obvious; and yet, finding good explanations of how JavaScript actually works isn’t all that easy, so let’s learn! With some handy visualisations, and fun hacks, let’s get an intuitive understanding of what happens when JavaScript runs.

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