sign property

double sign
override

Returns the sign of the double's numerical value.

Returns -1.0 if the value is less than zero, +1.0 if the value is greater than zero, and the value itself if it is -0.0, 0.0 or NaN.

Implementation

double get sign;

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https://api.dart.dev/stable/2.13.0/dart-core/double/sign.html