Conditional rendering JS React
Posted on October 2, 2021
Tags: javascript
(undefined || []) --> []1 JS
1.1 Map Filter Reduce
undefined array will crash so fallback to empty array.
SomeArr = mkArr(..) //undefined
(SomeArry || []).filter(...)2 JSX
Render only when dataSet is defined
<div>
dataSet && <Chart info={dataSet}/>
</div>
