chunk method
Implementation
List<List<T?>?> chunk([int size = 1]) {
size = max(size, 0);
var length = this.length;
if (length < 1 || size < 1) {
return <List<T>>[];
}
var index = 0;
var result = <List<T?>?>[];
while (index < length) {
result.add(_privateSlice(index, (index += size), false));
}
return result;
}