Value Is Stream

Introduction

In this lab, we will explore fundamental concepts of JavaScript programming language. This lab is designed to help beginners develop their skills in JavaScript programming by providing hands-on experience with various programming tasks. By the end of this lab, you will have a better understanding of core JavaScript concepts such as variables, data types, functions, and control structures. This lab will serve as a strong foundation for your journey towards becoming a proficient JavaScript developer.

Skills Graph

How to Check If a Value Is a Stream in Node.js

To check if a value is a stream in Node.js, you can use the isStream function. To use this function, follow these steps:

1. Open the Terminal/SSH.
2. Type node to start practicing coding.
3. Use the isStream function to check if the given argument is a stream.
4. To check if the value is different from null, use the following code:

const isStream = (val) =>
  val !== null && typeof val === "object" && typeof val.pipe === "function";

5. To check if a file is a stream, use the following code:

const fs = require("fs");

isStream(fs.createReadStream("test.txt")); // true

Summary

Congratulations! You have completed the Value Is Stream lab. You can practice more labs in LabEx to improve your skills.