This is my solution to a process review in which I was given specifications, then tasked with using test driven development practices to develop a bandpass filter.
Below is what I captured from the information provided whilst on the call, as well as a table of examples I created which I based my tests upon. The tests are written using Jest and are all passing.
Electronic music producers apply our filters to change how their tracks sound.
Create a bandpass filter.
The bandpass filter will take 3 inputs.
- Music track - an array of frequencies.
- Each frequency is represented by an integer.
- Must never be an emtpy array or contain null.
- lower limit of the bandpass filter represented by a single integer.
- upper limit of the bandpass filter represented by a single integer.
| Input | Output |
|---|---|
| [20] 30, 40 | [30] |
| [10, 50] 20, 60 | [20, 50] |
| [100, 200, 100] 150, 180 | [150, 180, 150] |
| [20, 30, 40, 50, 60] 25, 45 | [25, 30, 40, 45, 45] |
| [400, 900, 600] 500, 700 | [500, 700, 600] |
| [1000, 500, 1200] 400, 1100 | [1000, 500, 1100] |
| Edge Cases | |
| [] | throw error - "input track is empty" |
| [null] | throw error - "input is corrupted" |
| [10] 40, 20 | throw error - "lower limit must be less than or equal to the upper value." |