Intro
So we installed NodeJS on our machine.
Now we want to write a simple script, run it from the terminal & talk/answer to the terminal
Write a simple script
- Open your terminal
- Create a file named
index.js:
touch index.js
- Add this JavaScript code into it:
process.stdout.write("What's your name?\n");
process.stdin.on("readable", () => {
const userInput = process.stdin.read();
process.stdout.write(`Your Input was: ${userInput}`);
});
Note: I removed all "unnecessary" stuff from the documentation to decrease the complexity of this simple example.
Every line decoded
// writes something to the stdout (your terminal), including a newline at the end
process.stdout.write("What's your name?\n");
Console.log() uses stdout under the hood.
// if a specific event (here: a readable stream) happens, then run this callback
process.stdin.on('readable', () => {...});
Documentation for readable stream
// read data from the stream & save it into a variable
const userInput = process.stdin.read();
// writes something to the stdout
process.stdout.write(`Your Input was: ${userInput}`);
Run it from the terminal
- Run it:
node index.js
- Result:
What`s your name?
miku86
Your Input was: miku86