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Alessandro Ferro 2024-08-07 11:57:28 +02:00
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@ -4,10 +4,12 @@ JavaScript is single-threaded but it can still take advantage of asynchronous
programming. programming.
When we say JavaScript is single-threaded, we mean that we cannot write When we say JavaScript is single-threaded, we mean that we cannot write
multithread code without using JavaScript APIs. In fact, multithread/concurrent code without using JavaScript APIs. In fact,
despite for us it appears single-threaded, it takes advantage of the despite for us it appears single-threaded, it takes advantage of the
`libuv` library, allowing the engine to be effectively multithread. `libuv` library, allowing the engine to be effectively multithread.
Another way to put it is that we have one and only one Call Stack.
In order to do that, JavaScript uses In order to do that, JavaScript uses
* The libuv APIs which allow multithreading * The libuv APIs which allow multithreading
* The Event Loop Queue * The Event Loop Queue
@ -43,3 +45,8 @@ When 1000ms have elapsed, the callback function associated with the timer (conso
gets enqueued in the Queue. gets enqueued in the Queue.
Since there is nothing to do in the stack, the callback pushes the callback onto the Since there is nothing to do in the stack, the callback pushes the callback onto the
stack and executes it. stack and executes it.
## Useful resources
* https://www.youtube.com/watch?v=lqLSNG_79lI
* https://dev.to/lydiahallie/javascript-visualized-event-loop-3dif
* https://www.youtube.com/watch?v=eiC58R16hb8