Euclidean modulo operator.
Returns the remainder of the Euclidean division. The Euclidean division of two integers a and b yields two integers q and r such that a == b * q + r and 0 <= r < b.abs().
The Euclidean division is only defined for integers, but can be easily extended to work with doubles. In that case r may have a non-integer value, but it still verifies 0 <= r < |b|.
The sign of the returned value r is always positive.
See remainder for the remainder of the truncating division.
double operator %(num other);
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https://api.dart.dev/stable/2.5.0/dart-core/double/operator_modulo.html