Why does my code doesn't run in order? GdlJs - Guadalajara Javascript Meetup (2019)
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This document discusses the JavaScript event loop and how it allows JavaScript to appear asynchronous and concurrent despite being single-threaded. It explains that JavaScript can manipulate asynchronous behaviors through the event loop, which processes tasks in the task queue after the call stack is empty. This allows asynchronous functions to finish and callbacks to be processed after synchronous code completes, giving the appearance of concurrency.
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- 1. ¿Por qué mi código no corre en orden? 😡 Una breve explicación del `Event Loop` en Javascript - Alejandro Escobedo
- 2. ¿Cuál es el resultado esperado de esto?
- 4. ¿Qué hemos escuchado de Javascript? - No bloqueante - Un solo hilo - Asíncrono - Concurrente
- 5. ¿Qué es en realidad Javascript? - Sincrono - Bloqueante - Un solo hilo
- 6. ¿Entonces… cómo es posible que un lenguaje sea de un solo hilo, no bloqueante, asíncrono, concurrente?
- 7. La realidad es que puedes manipular JavaScript para que se comporte de manera asíncrona
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- 39. Si estamos bloqueando el hilo de ejecución, el navegador y otros procesos no pueden seguir
- 40. Qué pasa cuando hacemos uso de lo asíncrono?
- 42. call stack main() web / c++ apis DOM ajax (xmlHttpRequest) setTimeout
- 43. call stack main() web / c++ apis task queue console.log(‘Hola’)
- 44. call stack main() web / c++ apis task queue
- 45. call stack main() web / c++ apis task queue getAsync(url, cb)
- 46. call stack main() web / c++ apis task queue getAsync(url, cb) xhr(‘/url’) cb
- 48. call stack main() web / c++ apis task queue getAsync(url, cb) xhr(‘/url’) cb
- 49. call stack main() web / c++ apis task queue xhr(‘/url’) cb
- 50. call stack main() web / c++ apis task queue xhr(‘/url’) cb console.log(‘A…’)
- 51. call stack main() web / c++ apis task queue xhr(‘/url’) cb console.log(‘A…’) cb()
- 52. call stack main() web / c++ apis task queue console.log(‘A…’) cb()
- 53. call stack main() web / c++ apis task queue cb()
- 54. call stack web / c++ apis task queue cb()
- 55. call stack web / c++ apis task queue cb() cb()
- 56. call stack web / c++ apis task queue cb()
- 57. call stack web / c++ apis task queue
- 58. Gracias!