operator []= method
Sets the number of occurrences
of an element
.
Throws an ArgumentError if occurrences
is negative.
Implementation
void operator []=(E element, int occurrences) {
if (occurrences < 0) {
throw ArgumentError.value(
occurrences, 'occurrences', 'Negative number of occurrences');
} else {
final current = this[element];
if (occurrences > 0) {
_container[element] = occurrences;
_length += occurrences - current;
} else {
_container.remove(element);
_length -= current;
}
}
}