I'm mapping through a list of comments and I am returning a component. is there a way I could select every even one?

crayonne 0
Viewed 41

I'm mapping through an array of comments and I am returning the same component that handles the data passed to it. It is kind of confusing because I can not tell which is odd or even and I need to style it based on that.

      <div className="comments">
        <h3>comments</h3>
        //here
        <Comment />
      </div>

if it were like this, I would have known what to do


      <div className="comments">
        <h3>comments</h3>
        <ul>
          <li>You look good!</li>
          <li>You are amazing!</li>
          <li>What  a wonderful project!</li>
          <li>Are you free tomorrow? let's cook.</li>
        </ul>
      </div>
reactjs javascript
3 Answers

You can pass a prop into the component and use it to style it. For example:

const Comment = ({customClass, data}) =>{
  return (<div className = {customClass}> {data} </div>)
}
Const App = () =>{
//Example data Arr
const dataArr = ["hello", "bye"]
return (<div className="comments">
        <h3>comments</h3>
        {dataArr.map((data, idx) => <Comment
customClass = {idx % 2 === 0 ? "Custom Class" : ""} data={data} />}
      </div>)
}

However, you can also look at the <Comment/> component and see what html it returns, and style through css selectors like :nth-child()

li:nth-child(odd) {
    color: black;
}
li:nth-child(even) {
    color: red;
}

The latter is more peformant on browsers so I would attempt that first. If you need more fine grain control over determining the styles, you can try the former to attach custom class names

Arky Asmal0

Using JS you need to loop through all li elements and as per their index order, you can style them. But you can do it using CSS in a more simpler way. I would recommend that.

li:nth-child(odd) {
    color: green;
}
li:nth-child(even) {
    color: blue;
}
<div className="comments">
    <h3>comments</h3>
    <ul>
      <li>You look good!</li>
      <li>You are amazing!</li>
      <li>What  a wonderful project!</li>
      <li>Are you free tomorrow? let's cook.</li>
    </ul>
  </div>

Amar Singh0

If you want to style the list with respect to add/even.

li:nth-child(even) {        
    background-color: antiquewhite;
 }
li:nth-child(odd) {        
    background-color: red;
 }
Dev.skas0
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