Node Flashcards
What is a CLI?
CLI (command line interface) is a way for a user to see commands in a form of lines of text
What is GUI?
GUI (graphical user interface) is a way for a user to see commands in a form of graphical icons
What is GUI?
GUI (graphical user interface) is a way for a user to see commands in a form of graphical icons
Give at least one use case for each of the commands listed in this exercise.
- man
- cat
- ls
- pwd
- echo
- touch
- mkdir
- mv
- rm
- cp
man man (displays man manual)
cat (concatenate files and print on the standard output)
ls (to list out the contents of the directory currently being worked on)
pwd (to make sure you’re working on the correct directory)
echo (display a line of text)
touch (to create new files)
mkdir (to make a new directory)
mv (to rename a file)
rm (to delete a file)
cp (to make copies)
What are the three virtues of a great programmer?
Laziness, Impatience, and Hubris.
What are 3 components of a fullstack Web architecture?
Presentation
Logic
Data
What is Node.js?
A javascript runtime to build scalable network applications
What can Node.js be used for?
Usually to run the backend side of applications as well as servers
What is REPL?
Reads input
Executes input
Prints input
Loops input
When was Node.js created ?
2009
What backend languages have you heard of?
Python, PHP. C#, Ruby, C++ and Java
What is a computer process?
The instance of a computer program that is being executed by one or more threads
Roughly how many computer processes are running on your host operating system (Task Manager or Activity Monitor)?
A lot
Why should a full stack Web developer know that computer processes exist?
To be aware of what you’re executing
What is the process object in a Node.js program?
A global that provides information about, and control over, the current Node.js process.
How do you access the process object in a Node.js program?
With the variable process
What is the data type of process.argv in Node.js?
An array of strings
How do you access the command line arguments in a Node.js program?
Within splice(2)
What is process.argv?
The process.argv property returns an array containing the command line arguments passed when the Node.js process was launched
What is a JavaScript module?
A file with code
What are the advantages of modular programming?
Makes it a bit easier and organized on breaking down larger problems
In JavaScript, how do you make a function in a module available to other modules?
Using the Export keyword
In JavaScript, how do you use a function from another module?
Using the Import keyword with curly braces if no default was exported
What is the JavaScript Event Loop?
A mechanism through which the ‘calls waiting for execution’ in the callback queue/job queue can be put on the call stack
What is different between “blocking” and “non-blocking” in respect to how code is executed?
Blocking executes synchronously
Non-Blocking executes asynchronously
What is a directory?
A container that holds file (a.k.a foler)
What is a relative file path?
The location of a file relative to the current (working) directory*
What is an absolute file path?
A file that always starts at the root (always starts with a slash)
What module does Node.js include for manipulating the file system?
fs file system
What method is available in the node:fs module for reading data from a file?
readFile
what is ./
The current directory / folder
async arrow function
const name = async ( ) => { };
What method is available in the node:fs module for writing data to a file?
writeFile()
Are file operations using the fs module synchronous or asynchronous?
Asynchronous because file operations are slow
