description

# addAll method Null safety

void addAll (

1. Iterable<E> iterable

)
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) {
      throw new UnsupportedError("Cannot add to immutable List.");
    }