get colorScheme() {
      return this.items.map(avatar => avatar._effectiveBackgroundColor);
    }
Returns an array containing the <code>AvatarColorScheme</code> values that correspond to the avatars in the component.
@readonly
@type {sap.ui.webc.main.types.AvatarColorScheme[]}
@name sap.ui.webc.main.AvatarGroup.prototype.colorScheme
@defaultValue []
@public