Function pop

packages/core/src/StateUtils.js:62–73

* Pops out a route from the navigation state. * Note that this moves the index to the position to where the last route in the * stack is at.

(state)

   * stack is at.
   */
  pop(state) {
    if (state.index <= 0) {
      // [Note]: Over-popping does not throw error. Instead, it will be no-op.
      return state;
    }
    const routes = state.routes.slice(0, -1);
    return {
      ...state,
      index: routes.length - 1,
      routes,
    };
  },

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