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verified publisher icon AlexGalhardo
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Mastering NodeJS :turtle:

References

Install Ubuntu

Event Loop

event_loop

https://github.com/AlexGalhardo/Learning-NodeJS/assets/19540357/32ac6d51-8ac6-48cc-a477-682602c9f683

Feature Processo Thread
Execução Linha própria Linha própria
Memória global (heap e data segmnent) Própria Compartilhada
Memória local (stack, registers, PCounter) Sim Geralmente
Consumo de memória Normal Ligeiramente menor
Manipuladores de recursos externos Proprietário Empresta do processo
Tempo de criação Relativamente longo Relativamente curto
Tempo de troca de contexto Relativamente longo Relativamente curto
Instâncias Múltiplas Múltiplas
Associação Um programa (executável) Um processo
Paralelismo Limitado Sim
Comunicação entre seus pares Só com um mecanismo de IPC Sim, dentro do processo
Eficiência de comunicação Não Sim
Comunicação direta com o OS Sim Não
Controle de exceções Próprio Próprio
Confiabilidade e segurança Sim Depende do código

Articles

Commands

  • $ npm init
  • $ npm init -y
  • $ npm start
    • "scripts": { "start": "node index.js",
  • $ npm run dev
    • "scripts": { "dev": "nodemon index.js",
  • Global Examples
    • $ sudo npm install -g nodemon
    • $ sudo npm install -g typescrypt
    • $ sudo npm install -g ts-node
    • $ sudo npm install -g express-generator
    • $ sudo npm install -g lite-server
  • Dependencies
    • $ npm install mustache-express
  • DevDependencies
    • $ npm install --save-dev @types/node
    • $ npm install --save-dev @types/mustache-express
    • $ npm install --save-dev @types/validator
    • $ npm install --save-dev @types/express
    • $ npm i -D @types/body-parser
      • -D = --save-dev

Latest Node Stable Version

  • $ sudo npm cache clean -f
  • $ sudo npm install -g n
  • $ sudo n stable
  • https://github.com/nvm-sh/nvm

NPM

  • $ sudo npm install -g npm

Update all NPM packages

  • $ npm i -g npm-check-updates
  • $ ncu -u

YARN

  • https://yarnpkg.com/getting-started/install
  • $ sudo npm install -g yarn

Modules/Packages

TypeScrypt

  • Links
    • https://www.typescriptlang.org/
    • https://www.typescriptlang.org/play
    • https://stackblitz.com/edit/typescript-dh6svr?file=example%2Fsupermario.ts
  • Comands
    • $ sudo npm install -g tsc typescript ts-node
    • $ npm install --save-dev @types/express @types/mustache-express @types/node copyfiles
    • $ tsc --init
    • $ tsc -w (ficar monitorando typescript)
  • package.json
    • "scripts":
      • "start": "tsc ; nodemon ./dist/app",
  • tsconfig.json
    • "outDir": "./dist",
    • "rootDir": "./src",
    • "module": "commonjs",
    • "moduleResolution": "node"

Performance and Best Practices

SSL/HTTPS

Import/Export Modules

Older module.exports (ES5)

  • Math.js
function sum(x, y) {
 return x+y;
}
module.exports = sum;
  • index.js
const Math = require('./Math');
console.log(`SUM: ${Math.sum(n1,n2)}`);

Modern Object (ES6+)

  • Math.ts
function sum(x:number, y:number):number {
 return x+y;
}
export default {
	sum:sum, // sum
};
  • index.ts
import * as Math from './Math';
console.log(`SUM: ${Math.sum(2,3)}`); // SUM: 5

Modern Functions (ES6+)

  • Math.ts
export function sum(x:number, y:number):number {
 return x+y;
}
  • index.ts
import { sum } from './Math';
console.log(`SUM: ${sum(2,3)}`); // SUM: 5

JSON SERVER FAST REST API

  • $ sudo npm install -g json-server
  • Change PORT
    • json-server --watch db.json --port 3004
  • create db.json
{
  "products": [
    {
      "id": 1,
      "name": "Sushi",
      "description": "A melhor comida que existe.",
      "price": 8.5,
      "category_id": 1
    },
    {
      "id": 2,
      "name": "Batata Frita",
      "description": "Só o Cristiano Ronaldo não gosta.",
      "price": 10.5,
      "category_id": 1
    },
    {
      "id": 3,
      "name": "X-Tudo",
      "description": "Melhor lanche que existe.",
      "price": 12.5,
      "category_id": 1
    },
    {
      "id": 4,
      "name": "Tubaina",
      "description": "Os clássicos a gente nunca esquece.",
      "price": 14.5,
      "category_id": 2
    },
    {
      "id": 5,
      "name": "Koka Kola",
      "description": "Refrigerante que faz mal.",
      "price": 5.5,
      "category_id": 2
    },
    {
      "id": 6,
      "name": "Dollynho",
      "description": "Seu amiguinho, vamos brincar?",
      "price": 7.5,
      "category_id": 2
    }
  ],
  "categories": [
    {
      "id": 1,
      "name": "Comida"
    },
    {
      "id": 2,
      "name": "Refrigerantes"
    }
  ]
}
  • $ json-server --watch db.json
>
Request URL Details headers: { 'Content-Type': 'application/json' }
GET http://localhost:3000/products Return all products
GET http://localhost:3000/products/1 Return product by ID
POST http://localhost:3000/products Create new product { "nome": "Bolo de Cenoura com cobertura de chocolate", "descricao": "DELÍCIA", "preco": 9.5, "categoria_id": 1 }
PUT http://localhost:3000/products/1 Update all product data by ID { "name": "Sushi edited", "description": "description edited", "preco": 10.5, "category_id": 1 }
PATCH http://localhost:3000/products/1Update some product data by ID { "name": "New Sushi Name" }
DELETE http://localhost:3000/products/1 Delete a product by ID
GET http://localhost:3000/products?name=Sushi Filter products by name
GET http://localhost:3000/products/?_page=1&_limit=2 Get products by Pagination
GET http://localhost:3000/products/?_sort=nome&_order=desc Get products order by

Exampe with Node-Fetch

  • $ npm install node-fetch
const fetch = require('node-fetch');

const API_URL = 'http://localhost:3000';
const ENDPOINT = 'products';

// --------- GET
fetch(`${API_URL}/${ENDPOINT}`, {
  "method": "GET"
})
  .then(response => response.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));


// --------- POST
fetch(`${API_URL}/${ENDPOINT}`, {
     method: 'POST',
     body: JSON.stringify({
        "name": "New item adicionado com NODEJS",
        "description": "npm init e tals",
        "price": 19.90,
        "category_id": 1
     }),
     headers: { 'Content-Type': 'application/json' },
 })
 .then(res => res.json())
 .then(json => console.log(json));


// --------- PUT
const product_id_to_put = 8;

fetch(`${API_URL}/${ENDPOINT}/${product_id_to_put}`, {
  method: 'PUT',
  body: JSON.stringify({
        "name": "PRODUTO 8 ATUALIZADO",
        "description": "description atualized",
        "price": 59.90,
        "category_id": 2
  }),
  headers: { 'Content-Type': 'application/json' },
})
  .then(response => response.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));


// --------- PATCH
const product_id_to_patch = 12;

fetch(`${API_URL}/${ENDPOINT}/${product_id_to_patch}`, {
    method: 'PATCH',
    body:    JSON.stringify({
        "name": "Item 12 nome atualizado",
        "price": 39.90,
    }),
    headers: { 'Content-Type': 'application/json' },
})
  .then(response => response.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));


// --------- DELETE
const product_id_to_delete = 3;
fetch(`${API_URL}/${ENDPOINT}/${product_id_to_delete}`, {
  method: 'DELETE'
})
  .then(response => response.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));


// --------- FILTER BY NAME
const filterName = 'Sushi';

fetch(`${API_URL}/${ENDPOINT}?name=${filterName}`, {
  "method": "GET"
})
  .then(response => response.json())
  .then(json => console.log(json))
  .catch(err => console.error(err)); 


// ---------- ORDER BY
const ORDER = 'DESC';
const SORT = 'preco';

fetch(`${API_URL}/${ENDPOINT}/?_sort=${SORT}&_order=${ORDER}`, {
  "method": "GET"
})
  .then(response => response.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));


// ----------- PAGINATION
let page = 3;
let limit = 4;
fetch(`${API_URL}/${ENDPOINT}/?_page=${page}&_limit=${limit}`, {
  "method": "GET"
})
  .then(response => response.json())
  .then(json => console.log(json))
  .catch(err => console.error(err));

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verified publisher icon AlexGalhardo

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Mastering NodeJS :turtle:

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