Typescript Demo

demo.ts

import * as _ from 'lodash'; // or import _ = require('lodash')

interface HTTPRequest{
  code: 200|400;
  message: string;
}

class Employee {
  name: string;
  age: number;
  bitmap: boolean[][]

  constructor (name = 'David') {
    this.name = name
    this.bitmap = [[false, true], [true, false], [false, true, true]]
  }

  greet () {
    return `Hi, ${this.name}!`
  }

  async setAge () {
    this.age = await this.fetchAge();
  }

  flatBitmap () {
    return _.flatten(this.bitmap)
  }

  fetchAge () {
    // const response: HTTPRequest = request()
    // if (response.code === 200) {}
    // else {
    //   response.code
    // }
    return Promise.resolve(25)
  }
}

const d = new Employee()
const w = new Employee('Wad')
console.log(d.greet())
console.log(w.greet())

d.setAge().then(data => {
  console.log('age set!')
  console.log(d.age)
})

info.md

I don't have a formal package.json here, but run this and you're all set:

npm i -g typescript npm i lodash @types/lodash

Enjoy!

tsconfig.json

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "es6",
        "noImplicitAny": true,
        "sourceMap": false,
        "alwaysStrict": true
    }
}