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Node.js · Theory

subprocess.send(message[, sendHandle[, options]][, callback]) function in Node.js

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Theory

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subprocess.send(message[, sendHandle[, options]][, callback]) function in Node.js

Don’t start subprocess.send(message[, sendHandle[, options]][, callback]) function with jargon. Start with read notes.txt. That is the whole point.

subprocess.send(message[, sendHandle[, options]][, callback]) function on the board: (err, data) => …. Then say what read notes.txt looks like after.

Skip subprocess.send(message[, sendHandle[, options]][, callback]) function and callback hell, no error-first shows up in a script.

Kabir ships subprocess.send(message[, sendHandle[, options]][, callback]) function in a script. That is the use case worth saying.

Don’t do this with subprocess.send(message[, sendHandle[, options]][, callback]) function: callback hell, no error-first. Interviewers spot it in ten seconds.

subprocess.send(message[, sendHandle[, options]][, callback]) function is not a lonely heading. Kabir ties it to read notes.txt.

Viva for subprocess.send(message[, sendHandle[, options]][, callback]) function: what it is → (err, data) => … → the mistake (callback hell, no error-first).

Exam tip

Say subprocess.send(message[, sendHandle[, options]][, callback]) function in one breath, then (err, data) => …, then callback hell, no error-first.

Example

function wait(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

(async () => {
  console.log("start");
  await wait(50);
  console.log("done");
})();

subprocess.send(message[, sendHandle[, options]][, callback]) function in Node.js — async/await sits on Promises — cleaner than nested callbacks.

Short notes

  • Defsubprocess.send(message[, sendHandle[, options]][, callback]) function — Kabir uses it for read notes.txt in a script.
  • Rulesubprocess.send(message[, sendHandle[, options]][, callback]) function → (err, data) => ….
  • Remembersubprocess.send(message[, sendHandle[, options]][, callback]) function + the event loop (a script).
  • Usesubprocess.send(message[, sendHandle[, options]][, callback]) function in a script (read notes.txt).
  • Trapsubprocess.send(message[, sendHandle[, options]][, callback]) function — callback hell, no error-first.
  • Exsubprocess.send(message[, sendHandle[, options]][, callback]) function → read notes.txt.

Questions

1

In one breath: what does subprocess.send(message[, sendHandle[, options]][, callback]) function do for Kabir?

2

Name one Node.js screen/job that needs subprocess.send(message[, sendHandle[, options]][, callback]) function.

3

Viva: one wrong answer people give for subprocess.send(message[, sendHandle[, options]][, callback]) function.

4

Change one input on read notes.txt. Predict the new result.

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