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68 lines
1.6 KiB
Markdown
68 lines
1.6 KiB
Markdown
# Node.js
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Asyncronous JavaScript Engine
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## Syllabus
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Moduli:
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- nvm, npm cli
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- tutti moduli standard
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- alcuni da npm (express?, cors?, nodemon?)
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## NVM
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### Windows
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```ps1
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nvm list # show installed node versions
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nvm list available # list installable versions of node
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nvm install <version> # install a version of node
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nvm install latest # install the latest version of node
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nvm use <version> # set <version> as default one
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nvm uninstall <version> # uninstall a version of node
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```
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### Linux
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```bash
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nvm ls # show installed node versions
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nvm ls-remote # list installable versions of node
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nvm install <version> # install a version of node
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nvm install node # install the latest version of node
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nvm install --lts # install the latest LTS version of node
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nvm use <version> # set <version> as default one
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nvm uninstall <version> # uninstall a version of node
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```
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## NPM
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```ps1
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npm init # init a project
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npm install <module> # install a module as global
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npm install <module> -P|--save-prod # install a module as local (aka --save)
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npm install <module> -D|--save-dev # install a module as local dev dependency
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```
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## Imports
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```js
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const pkg = require("module"); // load the file as JS object with an alias
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const { component } = require("module"); // load only a component of the module (can lead to name collision)
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const alias = require("module").component // set alias for component
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```
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## Exports
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```js
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// definitions
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module.exports = <variable/method/class/expression>; // dafoult export
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module.exports.exported_name = <variable/method/class/expression>;
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```
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