CODEWITHSUNDEEP
javascripthtmlnode.js
abubakar
abubakar

Reputation: 3

Assing a variable to callback function in javascript

The line of code below provides and output through the console but I want to assign the console.log data to a variable Below is a sample code

  const SerialPort = require('serialport')
const Readline = require('@serialport/parser-readline')
const port = new SerialPort('COM1', { baudRate: 9600 })

const parser = new Readline()
port.pipe(parser)



parser.on('data', line => variableName = `> ${line}`);

console.log(variableName);

Upvotes: 0

Views: 333

Answers (1)

EddieDean
EddieDean

Reputation: 1816

This function

line => variableName = `> ${line}`

isn't getting invoked, because the program hasn't gotten to the next tick of the event loop before you're calling console.log. This will never work. If you want to log that outcome, log it inside the .on callback

line => {
  const variableName = `> ${line}`;
  console.log(variableName);
}

I wrote it like that because the implicit return from the un-bracketed arrow function wasn't returning to anything anyway.

Upvotes: 2

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