"Data passed to a JavaScript callback function may result in an undefined

I've been experiencing some issues with callbacks and getting return data as undefined.

function goodMorning(name, msg) {
  return `${name} ${msg}`;
}

function greet(name, msg, cb) {
  const myName = "Sairam";
  console.log(`${cb(name)} ${cb(msg)} i am ${myName}`);
}

greet("Suvarna", "Good Morning", goodMorning);

After analyzing the code above, it seems that when passing the goodMorning function as a callback in the greet method, the console is logging the return data as undefined.

You can click here to view the console message for more details.

javascriptcallback

Answer №1

wakeUp (hello) is a method that takes in two parameters, but you are only providing one. You should adjust your code to:

${wakeUp(name, message)}

At the moment, you are only passing one argument to the wakeUp function instead of the required two, causing the second parameter to be undefined

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