Oh, never mind. I see that there is an initial value of an empty string supplied. Very cool!

Is this true? I don't see how this bit handles the first element in a long list. Since reduce() is not given an initial value, doesn't it start with an index value of 1? From MDN (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce): The index of the current element being processed in the array. Starts from index 0 if an initialValue is provided. Otherwise, it starts from index 1.

With ES6 the last line can be changed to return Math.min(...numCakes);

Hardcoded the answers to tests XD

yes but it doesn't work with very large numbers
ex. seven(30000000000) = [-1294967296, 1].
Math.trunc() is better practice.
Read more here: https://stackoverflow.com/questions/7487977/using-bitwise-or-0-to-floor-a-number