How on click rerender conmponent in react - reactjs

Question

When I click on a card, the loadAboutInfo function works through which I transfer data to another component and display it there. But if I click again on the same card, then it is duplicated. How can I fix it?I have check which take card id and then if it the same it render but I click again it render one more card, but i need if it already exist than new card mustn't render
loadAboutInfo=(pokemonValue,pockemonImg,pokemonId)=>{
this.setState(prevState => ({
pokemonValue:[...prevState.pokemonValue, pokemonValue],
pockemonImg,
pokemonId
}))
}
render() {
return (
<div className="wrapper">
<div className="pokemonlist__inner__cards">
<div className="pokemonlist__cards">
{this.state.pokemonList.map((value,index)=>{
let pokemonImgTemplate = this.state.pokemonImgTemplate;
let pokemonId = value.id;
let pockemonImg = pokemonImgTemplate.replace('{id}',pokemonId);
return(
<div className="pokemonListCard" key={index} onClick={()=>this.loadAboutInfo(value,pockemonImg,pokemonId)}>
<PokemonCard
pockemonImg={pockemonImg}
pokemonName={value.name}
pokemonTypes={value.types}
/>
</div>
)
})}
</div>
<PokemonLoadMore
loadMore={this.loadMore}
currentPage={this.state.currentPage}
/>
</div>
</div>
);
}
}
component where i map get data
render() {
return (
<div className="pokemon__about">
{this.props.pokemonValue.map((value,index)=>{
let totalMoves = value.moves.length;
return(
<div className="pokemon__about__wrapper" key={index}>
{this.props.pokemonId == value.id ?
<div className="pokemon__about__inner" key={index}>
<AboutImage
pockemonImg={this.props.pockemonImg}
/>
<AboutName
pockemonName={value.name}
/>
<div className="pokemon__about__table">
<AboutPokemonTypes
pokemonTypes={value.types}
/>
<table>
<AboutPokemonWeight
pockemonWeight={value.weight}
/>
<AboutPokemonMoves
totalMoves={totalMoves}
/>
</table>
</div>
</div>
:
null
}
</div>
)
})}
</div>
);

Answer 1

On the loadAboutInfo you can check if there is already a pokemon with the same id on pokemonValue array, something like this:
loadAboutInfo = (pokemonValue,pockemonImg,pokemonId) => {
// this will get the first element that matches the id
const exists = this.state.pokemonValue.find(pokemon => pokemon.id === pokemonId)
if (!exists) {
this.setState(prevState => ({
pokemonValue:[...prevState.pokemonValue, pokemonValue],
pockemonImg,
pokemonId
}))
}
}
So it will update the state only if the clicked pokemon isn't in the pokemonValue array