I tried to do something like first store the state in a different variable and then destructure by using the variable but it didn't work. A partir do ECMAScript 2020, pode-se utilizar a sintaxe do encadeamento opcional, que faz curto circuito avaliando a expressão para undefined assim que o acesso de propriedade a null ou undefined é efetivado. Cannot read property ‘catch‘ of undefined_小白仍在路上的博客-程 … But avoid …. Testing with Jest & Enzyme: TypeError: Cannot read … TypeError TypeError TypeError: Cannot read property 'toLowerCase' of undefined I just want to show the planet's name , diameter and rotation_period . node.js - Cannot read property 'catch' of undefined So I tried to learn how to do this on my own by taking two video courses about node and cheerio on udemy but I haven’t gotten any better at it. //... TypeError: Cannot read property of undefined 如果是两层表达式a.b则不会报错，返回的是undefined。. 这是在微信小程序中 使用上拉加载更多 时候出现的问题 发现是未定义节流阀导致多次发起请求页面数据 解决：在data中定义了一个节流阀，在获取数据的时候打开 在获取到数据后关闭节流阀 在上拉加载的methods方法中判断节流阀是否打开，如果打开则直接return出去，未打开就可以继续请求数据啦！ TypeError When testing my code, this is what shows in the developer console: Loading the code for the SEARCH WITH …