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ViewsHow to append deleted from array elements by slice method?
How to delete elements from start of array and append them into end ?
const ImageArray = [i1,i2,i3,i4,i5]
const clickHandler = (index: number) => {
let start = ImageArray.slice(index)
let end = ImageArray....
let result = start.concat(end)
return result
}
{ImageArray.map((image, index) => (
<div
onClick={() => clickHandler(index)}
key={index} style={{backgroundImage: 'url('+image+')'}}
/>
))}
P.S. It's not necessary to use slice method
·
Juan Pablo Isaza
3 answers
Answer question0
With x being the index clicked :
const arr = [0,1,2,3,4];
const newArr = [...arr.slice(1), ...arr.slice(0, 1)]
·
Juan Pablo Isaza
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You can do:
const arr = ['i1','i2','i3','i4','i5']
const clickHandler = i => [...arr.slice(i), ...arr.slice(0, i)]
console.log('i3:', clickHandler(2)) // Clicked: 'i3'
·
Juan Pablo Isaza
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0
Your function is designed to return a new array, but the place where you call the function is not doing anything with the returned value.
I assume you want to mutate ImageArray. In that case use splice to delete the first part, and push to append that same part at the end:
const clickHandler = (index: number) => {
ImageArray.push(...ImageArray.splice(0, index));
};
·
Juan Pablo Isaza
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