addAll method
override
Appends all objects of iterable
to the end of this list.
Extends the length of the list by the number of objects in iterable
.
Throws an UnsupportedError if this list is fixed-length.
Implementation
void addAll(Iterable<E> iterable) {
var list = (JS('bool', '# instanceof Array', iterable))
? iterable
: List.from(iterable);
callMethod('push', list);
}