Returns the integer closest to this.
Rounds away from zero when there is no closest integer:
(3.5).round() == 4 and (-3.5).round() == -4.
If this is not finite (NaN or infinity), throws an UnsupportedError.
Source
/**
* Returns the integer closest to `this`.
*
* Rounds away from zero when there is no closest integer:
* `(3.5).round() == 4` and `(-3.5).round() == -4`.
*
* If `this` is not finite (`NaN` or infinity), throws an [UnsupportedError].
*/
int round();