| How to format a number to a fixed number of decimal places with vanilla JS | 6/9 |
| The isNaN() and Number.isNaN() methods in vanilla JS | 3/6 |
| .abs() | |
| .ceil() | |
| .floor() | The Math.floor() function returns the largest integer less than or equal to a given number. |
| .max() | |
| .random() | |
| .round() |
| parseFloat() | The parseFloat() function parses an argument (converting it to a string first if needed) and returns a floating point number. |
| parseInt() |