explanationForPuzzle.txt

Problem: https://gist.github.com/timoxley/a34546c28c92025d040a391400ba5eb7

Solution: fns.forEach([].forEach.bind([1]))

Explanation: [].forEach.bind(someArray) will return a forEach function binded with passed `someArray`. So we can use this as iterator for `fns.forEach`. But the problem is fns.forEach will be executed `fns.length` times on `[].forEach.bind(someArray)` So each function inside fns will be called fns.length times.

fns.forEach.call(fns, [].forEach.call(fns)) // Will execute each function fns.length times
fns.forEach.call(fns, [].forEach.call([1,2])) // Will execute each function 2 times
fns.forEach.call(fns, [].forEach.call([1])) // Will execute each function 1 time