Returns the number of elements in this.
Counting all elements may involve iterating through all elements and can therefore be slow. Some iterables have a more efficient way to find the number of elements.
int get length { assert(this is! EfficientLengthIterable); int count = 0; Iterator it = iterator; while (it.moveNext()) { count++; } return count; }
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https://api.dartlang.org/stable/2.0.0/dart-core/Iterable/length.html