March 2025
Intermediate to advanced
240 pages
5h 54m
Spanish
Content preview from Eficiente Node.js
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Capítulo 2. Guiones y módulos
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En el Capítulo 1 utilizamos brevemente el comando node para explorar el modo REPL de Node y ejecutar scripts sencillos. En este capítulo, aprenderemos cómo carga y ejecuta Node scripts y módulos. Empezaremos explorando más opciones, argumentos y variables de entorno que pueden utilizarse con el comando node, y aprendiendo más sobre lo que podemos hacer en una sesión REPL. Luego conoceremos los pasos que sigue Node para cargar y ejecutar un módulo.
Nodo CLI
El comando node tiene muchas opciones que pueden utilizarse para personalizar su comportamiento. También admite argumentos y variables de entorno para personalizar aún más lo que hace, y para pasar datos del entorno del SO al entorno del proceso de Node.
Echemos un vistazo. En el terminal, escribe lo siguiente
$ node -h | less
Esto mostrará la documentación de ayuda de para el comando (una página cada vez, porque hemos canalizado la salida en el comando less ). Me resulta útil familiarizarme siempre con las páginas de ayuda de los comandos que utilizo a menudo:
Usage: node [options] [ script.js ] [arguments] node inspect [options] [ script.js | host:port ] [arguments] Options: - script read from stdin (default if no file name is provided, interactive mode if a tty) -- indicate the end of node options --abort-on-uncaught-exception aborting instead of exiting causes a core file to ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.