Node.js | A Light Intro to: Events, Streams, process, and Standard I/O (STDIO)

Node.js | A Light Intro to: Events, Streams, process, and Standard I/O (STDIO)

Node.js | A Light Intro to Events, Streams, Process, and Standard I/O (STDIO). The process Object - Events - Streams and STDIO. What is a Node.js process? That means that it can listen for of the event using the `on` method. The process.stdin property returns a stream connected to stdin

This article is a gentle introduction to some Node.js fundamentals. Feel encouraged to open up a Unix-like operating system and run the code using the command “node yourFile.js”.

We will cover:

  • The process Object

  • Events

  • Streams and STDIO

The Process Object

What is a process? A process is an instance of a program that is being processed by a processor. A process has many properties. Node.js introduces the process object to reveal process properties.

//Here we count 'keys' of the process object.
"use strict";  
console.log(Object.keys(process).length); //68

As you can see, this instance of the process object has 68 properties.

Output:

68

As shown below, we can check the process ID and the processes memory usage.

"use strict";
console.log(process.pid);  
console.table(process.memoryUsage());

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