setTimeout() nodejs

Explanation of setTimeout() in Node.js

In Node.js, the setTimeout() function is used to schedule the execution of a callback function after a specified delay. Here is an explanation of each step involved in using setTimeout() in Node.js:

  1. Importing the setTimeout() function: In Node.js, there is no need to import the setTimeout() function explicitly as it is a built-in function provided by the JavaScript runtime environment.

  2. Defining the callback function: The first argument to setTimeout() is the callback function that will be executed after the specified delay. This function can be defined inline or as a separate named function.

  3. Specifying the delay: The second argument to setTimeout() is the delay in milliseconds after which the callback function should be executed. For example, setTimeout(callback, 1000) will execute the callback function after a delay of 1000 milliseconds (1 second).

  4. Executing the callback function: After the specified delay, the callback function will be executed by the Node.js event loop. The callback function can contain any code that needs to be executed after the delay.

Here is an example of using setTimeout() in Node.js:

setTimeout(() => {
  console.log('Hello, world!');
}, 2000);

In this example, the callback function will be executed after a delay of 2000 milliseconds (2 seconds), and it will log the message "Hello, world!" to the console.

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