What you will use in this project
- let and const
- Conditionals and loops
- String and number methods
- Writing pure return-value functions
Web Project: JavaScript Toolkit
Complete each step in the editor and watch the result as your page takes shape.
Build your first JavaScript project, step-by-step
Build a starter library of pure JS helpers.
Each helper will run in the browser.
How it works
- 1 Follow the steps on the left. Each dot in the stepper bar is one focused chunk of work. Read the instructions, the “What to do” checklist, and any hints.
- 2 Write your code on the right. The editor is yours. Files auto-save as you type. Use the Preview tab to see your work in action.
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3
Click
Check codewhen you’re ready. We grade your work against the step’s rubric and tell you exactly what passed and what still needs work. - 4 Pass a step to move on. Build the project cumulatively. Pass every step to complete it and earn the full XP.
How it’s graded
This project is broken into 6 steps. Each one has its own pass criterion. Click Check code on every step to verify your progress and earn the full +90 XP.
| # | Step & pass criterion | Weight |
|---|---|---|
| 1 | Sum two numbers addNumbers(a, b) returns the sum | 15 pts |
| 2 | Capitalize the first letter capitalize(s) upper-cases the first letter | 15 pts |
| 3 | Reverse a string reverseString(s) reverses via a for loop | 15 pts |
| 4 | Check for a palindrome isPalindrome(s) compares lowercase to its reverse | 15 pts |
| 5 | Count the vowels countVowels(s) counts vowels with a loop | 20 pts |
| 6 | Render results init() writes each result into the page | 20 pts |
