I've found that some functions like `concat()` `push()` `every()` both exist in `Array` and `Array.prototype`(with firefox 57.0.1 console) It's confusing since prototype methods exist in `Array`. Additionally, where does staic method(`Array.from()`, `Array.isArray()` etc) exists in? [![enter image description here][1]][1] [1]: https://i.sstatic.net/9uEqZ.png