> They could say that other build systems are O(n) where n is the total number of files, while this one is O(n) where n is the number of modified files. It's im

> They could say that other build systems are O(n) where n is the total number of files, while this one is O(n) where n is the number of modified files. It's immediately clear then how this is better for the build use-case, while still making it clear how the efficient it is as the input size grows. That's a great, concise and clear articulation. The project would do well to quote you on that! If anyone's still struggling with the difference between O(1) and O(n), there's a common example with lists that might help: 1. Getting the head of a list is usually O(1). It doesn't matter how long the list is, getting the head element always takes the same amount of time. 2. Getting the length of a list is usually O(n). The time taken to count the list entries grows in proportion with the length of the list. As an aside, note also that a list with a single entry doesn't make the length function O(1).