Returns the double integer value obtained by discarding any fractional
digits from the double value of this.
If this is already an integer valued double, including -0.0, or it is a
non-finite double value, the value is returned unmodified.
For the purpose of rounding, -0.0 is considered to be below 0.0.
A number d in the range -1.0 < d < 0.0 will return -0.0, and
in the range 0.0 < d < 1.0 it will return 0.0.
The result is always a double. If this is a numerically large integer, the result may be an infinite double.
Source
/**
* Returns the double integer value obtained by discarding any fractional
* digits from the double value of `this`.
*
* If this is already an integer valued double, including `-0.0`, or it is a
* non-finite double value, the value is returned unmodified.
*
* For the purpose of rounding, `-0.0` is considered to be below `0.0`.
* A number `d` in the range `-1.0 < d < 0.0` will return `-0.0`, and
* in the range `0.0 < d < 1.0` it will return 0.0.
*
* The result is always a double.
* If this is a numerically large integer, the result may be an infinite
* double.
*/
double truncateToDouble();