# length property

int length

Returns the number of objects in this list.

The valid indices for a list are `0` through `length - 1`.

## Implementation

    int get length {
      // Check the length honours the List contract.
      var len = JS('', '#.length', _jsObject);
      // JavaScript arrays have lengths which are unsigned 32-bit integers.
      if (JS('bool', 'typeof # === "number" && (# >>> 0) === #', len, len, len)) {
        return JS('int', '#', len);
      }
      throw new StateError('Bad JsArray length');
    }

void length= (int length)

Changes the length of this list.

If `newLength` is greater than the current length, entries are initialized to `null`.

Throws an UnsupportedError if the list is fixed-length.

## Implementation

    void set length(int length) {
      super['length'] = length;
    }