43 lines
3.1 KiB
Plaintext
43 lines
3.1 KiB
Plaintext
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Episode: 1389
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Title: HPR1389: Javascript Corrections
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Source: https://hub.hackerpublicradio.org/ccdn.php?filename=/eps/hpr1389/hpr1389.mp3
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Transcribed: 2025-10-18 00:40:25
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---
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Hmm.
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Hello everyone, Sieg Flup here, Sieg Flups in a Slobble. You're listening to another episode
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of Hacker Public Radio. And in this episode, we're going to have a few corrections. Yes,
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that's right, corrections. The last episode of Hacker Public Radio, or the least the last
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episode that I made was about JavaScript. And there are a few errors. Well, it was just
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pretty much one error. I said it was the language of the future because of its concurrency. And
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this isn't really the case. It's asynchronous, but it does run non-concurrently. How to explain
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this is, I'll use no jasses in an example because it's uniform among platforms. And JavaScript
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in browsers vary. One of what happens is blocks of code get executed. And they're putting
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to a queue, a quote-unquote invent loop, if you like. But I like to call it a queue. And an
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analogy for this queue is packages going through a scanner at an airport, where the scanner
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executes. And the packages are what's created from reading lines of code, or blocks of code,
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and the blocks of code are the people. So you have blocks of code, and you have what actually
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does put into packages in the queue in the order at which it was executed. And they get put through
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the scanner, which executes them. Synchronously, in a lot of the cases, but JavaScript is asynchronous.
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Well, it's asynchronous when you have a block of code that requires. And I'll call a blocking
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call, for instance, or some sort of network call, where you fetch a network object, like HTML,
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HTML, XML, like an XML HTTP request, or something like that. What happens when you have something
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like that is the package gets taken off the queue and gets run until whatever is blocking unblocks.
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And then it gets put to the front of the queue, where it then calls a callback, for instance,
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or some other code that it runs, typically a callback. So that's how it works. That's why,
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if you have a spin lock on a variable, it actually brings JavaScript down to, it brings JavaScript
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to halt, the interpreter to a halt. Because you're executing a block of code that doesn't allow the
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queue to keep on moving. The package gets stuck in the scanner, if you will. And so that's the
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correction I'd like to make. Thank you for listening, everyone, and happy hacking.
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