Function jumpToIndex

packages/core/src/StateUtils.js:78–89

* Sets the focused route of the navigation state by index.

(state, index)

   * Sets the focused route of the navigation state by index.
   */
  jumpToIndex(state, index) {
    if (index === state.index) {
      return state;
    }

    invariant(!!state.routes[index], 'invalid index %s to jump to', index);

    return {
      ...state,
      index,
    };
  },

  /**
   * Sets the focused route of the navigation state by key.