elementAtE method
Returns the element at the specified index.
Iterates over the entire enumerable until it reaches the element on the
iteration matching the given index
. elementAtE will then return that
value. If the iteration reaches the end of the enumerable before arriving
at index
, an ElementNotFoundError will be thrown.
The value of index
must be a non-negative integer.
The elementAtE method will short-circuit after reaching the element at
index
and will not iterate further over the enumerable. In the worst
case, it will iterate over the entire enumerable.
Implementation
T elementAtE(int index) {
assert(index >= 0);
final iterator = this.iterator;
int currentIndex = 0;
while (iterator.moveNext()) {
if (currentIndex == index) return iterator.current;
currentIndex++;
}
throw ElementNotFoundError();
}