需要帮助来了解我的应用如何启动

Question

I have an app that plays Tic-Tac-Toe and Connect Four in the command line. Some of the code is boilerplate that I didn't write, and I'm having trouble understanding how it works.

When I run npm start , Connect Four plays as expected, but there is no way to play Tic-Tac-Toe. I want the user to choose to play either game. Ideally I would prompt the user, but having a command for each game would be fine.

There's a short server.js file that looks like this:

require('babel-polyfill');
require('babel-register');
require('.');

And in my package.json , I have main: "./connect4/index.js" .

As far as I can tell, this is all of the code relevant to starting the app. I apologize for the vague question. But the app isn't very complicated, so hopefully it makes some sense.

Answer 1

There's two ways you could do this. The first is by using the npm package inquirer which will allow you to prompt the user in the command line.

The alternative would be to use nodes built-in process.argv which is a property that will return an array with all the command line arguments you passed. Note that when using this, position [0] will default to the location of node on your machine, and position [1] will default to the current file location. To access custom arguments you will have to start at position [2] etc. So you could write logic that will run tic-tac-toe or connect 4 based on the value of argv at position 2. so somewhere in your code you would something like

 if (process.argv[2] === "tick-tack-toe") {
  console.log("do tick tack toe logic");
}else if (process.argv[2] === "connect-4") {
  console.log("do connect 4 logic");
}

Hope this helps. You can read more about process.argv here https://nodejs.org/docs/latest/api/process.html#process_process_argv

and here's a link to inquirer on github https://github.com/SBoudrias/Inquirer.js#readme

Answer 2

As background, when executing npm start npm will attempt to run the command node server.js if scripts.start is not specified in the package.json file.

Assuming executing node ./connect4/index.js works and that tic-tac-toe is similarly organized as connect4 then either of the following would work.

• Simply execute the command directly with node ./ticTacToe/index.js (assuming ticTacToe is the directory and index.js is the main file to be executed).
• Add a scripts: {ticTacToe: "node ./ticTacToe/index.js"} (or anything you want to call it) to package.json and then execute npm run ticTacToe .

Answer 3

Thanks for the feedback. I added a top-level index.js file, imported the relevant code from each game into that file, and used Inquirer to prompt the user to choose a game.

Adding scripts for ticTacToe and c4 to my package.json didn't work because I think my server.js file is needed to parse import/export syntax.

Repo is here , if curious.