react-addons-update

 

react-addons-update這個套件legacy嘍，要做新專案可以改用immutability-helper

可以解決深淺拷𢭲的問題，這本書有寫一個應用例子：

ReactJS by Example – Building Modern Web Applications with React

const newState = update(this.state, {
      selectBooks: { $splice: [[bookIndex, 1, books]] },
    });