Hello worlds

flask

flaskhello flask
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from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello World!'

if __name__ == '__main__':
    app.run()

micro

microhello micro
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const sleep = require('then-sleep')

module.exports = async (req, res) => {
  await sleep(500)
  return 'Ready!'
}

express

expresshello express
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const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => res.send('Hello World!'))

app.listen(port, () => console.log(`Example app listening on port ${port}!`))

feathers

feathershello feathers
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const feathers = require('@feathersjs/feathers');
const app = feathers();

// Register a simple todo service that returns the name and some text
app.use('todos', {
  async get(name) {
    // Return an object in the form of { name, text }
    return {
      name,
      text: `You have to do ${name}`
    };
  }
});

// A function that gets and logs a todo from the service
async function getTodo(name) {
  // Get the service we registered above
  const service = app.service('todos');
  // Call the `get` method with a name
  const todo = await service.get(name);

  // Log the todo we got back
  console.log(todo);
}

getTodo('dishes');

eggjs

eggjshello eggjs
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const Controller = require('egg').Controller;

class HomeController extends Controller {
  async index() {
    this.ctx.body = 'Hello world';
  }
}

module.exports = HomeController;

nestjs

nestjshello nestjs
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import { Controller, Get, Req } from '@nestjs/common';

@Controller('cats')
export class CatsController {
  @Get()
  findAll(@Req() request) {
    return 'This action returns all cats';
  }
}