## This and Array Methods
If a ```this``` parameter is provided to ```forEach()``` and other Array Methods,
it will be passed to callback when invoked, for use as its this value.
Otherwise, the value ```undefined``` will be passed for use as its its value.
- (forEach)[https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach#Using_thisArg]
+ [forEach](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach#Using_thisArg)