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{
  "name": "George Washington",
  "birthday": "February 22, 1732",
  "address": "Mount Vernon, Virginia, United States"
}

{
  "first_name": "George",
 "last_name": "Washington",

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sd

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Passing in arguments via the command line

all command-line arguments received by the shell are given to the process in an array called argv

console.log(process.argv);

Now save it, and try the following in your shell:

$ node argv.js one two three four five

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Step 1 — Starting the TypeScript Project

To begin your TypeScript project, you will need to create a directory for your project:

mkdir typescript-project

Now change into your project directory:

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When we talk about mocking in Jest, we’re typically talking about

replacing dependencies with the Mock Function.

review the Mock Function, and then dive into the different ways you can replace dependencies with it. The Mock Function The goal for mocking is to replace something we don’t control with something we do,

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// myModule.test.js

jest.mock('./myModule.js', () => (
  {
    ...(jest.requireActual('./myModule.js')),
    otherFn: jest.fn()
  }
))

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Dockerizing a Node.js Web Application

https://semaphoreci.com/community/tutorials/dockerizing-a-node-js-web-application

What is Docker, Anyway?

“Docker is an open platform for building, shipping and running distributed applications. It gives programmers, development teams and operations engineers the common toolbox they need to take advantage of the distributed and networked nature of modern applications.”

is an abstraction on top of low-level operating system tools that allows you to run one or more containerized processes or applications within one or more virtualized Linux instances.

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Starting a new project

yarn init Adding a dependency

yarn add [package]
yarn add [package]@[version]
yarn add [package]@[tag]

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   const { container, getByDisplayValue, getByTestId, debug } =  renderWithProviders(
            <FieldComponentRenderer  {...props} enableError={true}/>
        );

debug()

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import React from 'react'
import ReactDOM from 'react-dom'
import { Key } from '../utils/keyboardUtils'

export default class FocusManager extends React.Component {

  constructor(props) {
    super(props)
    this._immediateID = null
    this.state = {