REPL for interactive exploration in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does REPL stand for in Node.js?

REPL stands for Read-Eval-Print Loop. It is an interactive shell that reads your input, evaluates it, prints the result, and loops back to read again.

beginner

How do you start the Node.js REPL from the command line?

You start the Node.js REPL by simply typing node in your terminal and pressing Enter.

beginner

What happens when you type an expression in the Node.js REPL?

The REPL reads your expression, evaluates it immediately, and prints the result right away, allowing quick testing and exploration.

beginner

Name one way to exit the Node.js REPL.

You can exit the Node.js REPL by pressing Ctrl + C twice or typing .exit and pressing Enter.

beginner

What is one benefit of using the Node.js REPL for beginners?

It allows beginners to try out JavaScript code quickly without creating files, helping them learn by immediate feedback and experimentation.

What is the main purpose of the Node.js REPL?

A To create web servers automatically

B To compile JavaScript into machine code

C To run JavaScript code interactively and see results immediately

D To debug CSS styles

The REPL lets you type JavaScript code and immediately see the result, making it great for quick testing.

How do you start the Node.js REPL?

A npm repl

B node repl

C node start

D node

Typing node alone in the terminal starts the REPL.

Which command exits the Node.js REPL?

A .quit

B .exit

C exit()

D stop

Typing .exit or pressing Ctrl + C twice exits the REPL.

What does the REPL do after you enter a command?

A Reads, evaluates, prints the result, then loops back

B Only reads the command

C Saves the command to a file

D Compiles the command to binary

REPL stands for Read-Eval-Print Loop, describing this exact process.

Why is the Node.js REPL useful for beginners?

A It requires no setup to try code snippets

B It automatically fixes code errors

C It creates full applications

D It replaces text editors

The REPL lets beginners quickly test code without creating files or projects.

Explain how the Node.js REPL helps you learn JavaScript.

Think about how quick testing helps learning.

Describe the steps the REPL performs when you enter a command.

Remember what REPL stands for.