| # | title | topic | type | difficulty |
|---|---|---|---|---|
| 1 | Double every number | Arrays | Coding | Easy |
| 2 | Keep only the evens | Arrays | Coding | Easy |
| 3 | First negative number | Arrays | Coding | Easy |
| 4 | Make a CSV line | Arrays | Coding | Easy |
| 5 | Clamp a number to a range | Math |
| Coding |
| Easy |
| 6 | Pull values out with destructuring | Destructuring | Coding | Easy |
| 7 | Count an object's keys | Objects | Coding | Easy |
| 8 | Merge in defaults with spread | Objects | Coding | Easy |
| 9 | Sum 1 to n with a for loop | Loops | Coding | Easy |
| 10 | Countdown with while | Loops | Coding | Easy |
| 11 | Extract the hostname | URL & Web APIs | Coding | Easy |
| 12 | Format a price with toFixed | Floating Point | Coding | Easy |
| 13 | Dollars to cents, safely | Payments | Coding | Easy |
| 14 | Sort numbers correctly | Sorting Algorithms | Coding | Easy |
| 15 | Reverse a string | Interview Classics | Coding | Easy |
| 16 | Palindrome check | Interview Classics | Coding | Easy |
| 17 | FizzBuzz, the classic | Algorithms & Recursion | Coding | Easy |
| 18 | Build makeStub | Testing Lifecycle | Coding | Easy |