ES6条件if语句，用于检查数组是否为空 [英] ES6 conditional if statement to check if arrays are empty

问题描述

我似乎无法让jsx es6的if语句起作用.我在做什么错了?

I can't seem to get my jsx es6 react if statement to work.. What am I doing wrong?

const otherVariables = doesntMatter;    

return (
...
    <div>
    {if (props.student.length == null && props.teacher.length == null) => (
       <p>empty</p>
    ) : (
       <p>not empty</p>
    )} 
   </div>
...
)

如何检查两个数组是否为空?

How can i check if both arrays are empty?

推荐答案

存在语法错误，您正在测试lambda表达式.

There is a syntax error, you are testing an lambda expression.

您可以做类似

return !!props.student.length && !!props.teacher.length ? <p>not empty</p> : <p>empty</p>;

这篇关于ES6条件if语句，用于检查数组是否为空的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！