Ch 13 · Mini-Projects & Practice · JavaScript

Topic 13 of 13 in JavaScript — Complete Tutorial (Beginner) — 5 lessons.

Simple Calculator

This project builds a reusable calculate function that accepts two numbers and an operator symbol as a string, then performs the correct arithmetic operation using a switch statement. It handles division by zero safely and returns a descriptive error message instead of crashing. Notice how the function can return either a number or a string depending on the situation.

Grade Reporter

This project defines a student record object, a function to determine the grade from an average, and a function to generate and print a full formatted report card. It uses objects, arrays, loops, functions, template literals, and conditionals — nearly every concept in this tutorial. The report is formatted with aligned columns using padEnd() from the strings chapter.

Number Guessing Game Logic

This project implements the core logic of a number guessing game without needing a real user — it simulates a list of guesses and processes each one in a loop. It uses functions, conditionals, arrays, loops with break, and template literals. In a real interactive version, the guesses would come from user input, but the logic would be identical.

Practice Exercises

Now You Try!

Try to practice by writing your own code. Reading code teaches you a little — *writing* it teaches you a lot! Open the playground beside this card, pick one of these mini-challenges, and build it from scratch:

All topics in JavaScript Beginner

1. Introduction to Programming & JavaScript
2. Your First JavaScript Program
3. Variables — Your Data Containers
4. Data Types — Kinds of Values
5. Operators & Expressions
6. Conditional Statements
7. Loops & Iterations
8. Functions
9. Arrays — Lists of Data
10. Objects & Classes
11. Strings — Working with Text
12. Error Handling
13. Mini-Projects & Practice