Enumerable<T>.generate constructor
Creates an enumerable of count
length, where each element is generated
from a given Generator function.
A convenience factory to create an enumerable of a given count
length.
On generation, every element is created by calling generator
, passing in
the index of that element.
Optionally takes a boolean useCache
value. If true
, the returned
enumerable will contain a buffer with the calculated values.
Otherwise, the enumerable will calculate the values every time it is
iterated. (useCache
defaults to false
.)
Implementation
factory Enumerable.generate(int count, Generator<T> generator,
{bool useCache = false}) {
RangeError.checkNotNegative(count);
if (count == 0) return Enumerable<T>.empty();
if (useCache) return GeneratedEnumerable.withCache(count, generator);
return GeneratedEnumerable(count, generator);
}