Bit-wise and operator.
Treating both this
and other
as sufficiently large two's component integers, the result is a number with only the bits set that are set in both this
and other
Of both operands are negative, the result is negative, otherwise the result is non-negative.
int operator &(int other);
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https://api.dart.dev/stable/2.5.0/dart-core/int/operator_bitwise_and.html