I am learning React and I think I am missing something fundamental with updating the state / rendering components.
const allFalse = new Array(data.length)
const allTrue = new Array(data.length)
allFalse.fill(false)
allTrue.fill(true)
const [memoryStatus, setMemoryStatus] = useState(allFalse)
const [baseValue, setBaseValue] = useState(false)
The memory game has 5 cards at this point (just learning here) and depending on the memoryStatus it is determined if one side or other side is shown (true / false).
When clicked on a card I obviously want to change the value of that card in the array. I am doing that with this function:
const handleChange = (position) => {
const newMemoryStatus = memoryStatus.map((item, index) =>
{
if(index === position) {
return !item
}
else return item
}
)
// i really dont understand why this does not change the state
setMemoryStatus[newMemoryStatus]
}
The render part is:
<div className={styles.container}>
{data.map((item, index) => {
return (
<div
key={index}
onClick={() => {handleChange(index)}}
className={styles.card}
>
{!memoryStatus[index] && <Image
src={item.img}
width="100px"
height="100px"
/>}
<span>
<center>
{memoryStatus[index] ? item.latinName : ''}
</center>
</span>
</div>
)})
}
</div>
Just in case it matters my data looks like this:
const data = [
{
name: 'Staande geranium',
latinName: 'Pelargonium zonate',
img: '/../public/1.png'
},
{
name: 'Groot Afrikaantje',
latinName: 'Tagetes Erecta',
img: '/../public/2.png'
},
{
name: 'Vuursalie',
latinName: 'Salvia splendens',
img: '/../public/3.png'
},
{
name: 'Kattenstaart',
latinName: 'Amaranthus caudatus',
img: '/../public/4.png'
},
{
name: 'Waterbegonia',
latinName: 'Begonia semperflorens',
img: '/../public/5.png'
}]
What am I doing wrong ??
Advertisement
Answer
setMemoryStatus is a function, thus you should be using parentheses () instead of brackets [] when calling it. The line to call it should be:
setMemoryStatus(newMemoryStatus);