Truncating division operator.
If either operand is a double then the result of the truncating division a ~/ b
is equivalent to (a / b).truncate().toInt()
.
If both operands are ints then a ~/ b
performs the truncating integer division.
int operator ~/(num other);
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https://api.dartlang.org/stable/2.0.0/dart-core/num/operator_truncate_divide.html