https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/from
Array.from({length: n+1}) is like creating array as usual by new Array(length) (but this is bad approach as it is not recommended to use constructor for creating array). The bad thing with that is that we can't use map to define each of it's element because all of them are undefined. So this what is the feature of the Array.from I think, that the second parameter is a function which allows us to define each element of the array like you can do it with map method.

It does not look like the same to me and every single array item would be negative on that check.