Node.js Flashcards
What is Node.js?
a program that allows JavaScript to be run outside of a web browser
What can Node.js be used for?
building back ends for web applications, command-line programs, or any kind of automation that developers wish to perform
What is a REPL?
Read-Evaluate-Print-Loop : a simple interactive computer programming environment that takes single user inputs, executes them, and returns the result to the user (e.g: dev tools console, node REPL)
What is a computer process?
the instance of a computer program that is being executed by one or many threads - contains the programs code and activity
(a running instance of a computer program)
Why should a full stack Web Developer know that computer processes exist?
full stack web development is based on making multiple processes work together to form one application.
- some apps are made of multiple components such as clients, servers, and databases
What is the process object in a Node.js program?
a global object that provides information about, and control over, the current Node.js process
How do you access the process object in a Node.js program?
as a global object, it’s always available to Node.js applications.
What is the data type of process.argv in Node.js?
returns an Array of strings ( containing the command-line arguments passed when the Node.js process was launched)
What is a JavaScript Module?
a single .js file
What values are passed into a Node.js module’s local scope?
exports, require, module, __filename, __dirname
Give two examples of truly global variables in a Node.js program:
- process
- global
What is a directory?
a special type of file that lists other files
What is a relative file path?
a file path relative to the current directory
What is an absolute file path?
the path to a file starting at the root
What module does Node.js include for manipulating the file system?
the fs module
