Output an array where a value is added to the next value of the array. The Last value will be added with the first value.
Example: [45, 4, 9, 16, 25] Converted to: [49, 13, 25, 41, 70]
Map() method must be used.
You can try following:
console.log([45, 4, 9, 16, 25].map((item, index, array) => item + array[(index + 1) % array.length]))When using Array.prototype.map() you can use the index parameter and in each iteration
to see if it's the end of the array or not like so:
const arr = [45, 4, 9, 16, 25];
const newArr = arr.map((item, i) => {
return i !== (arr.length - 1) ? item + arr[i + 1] : item + arr[0];
})
console.log(newArr);This works fine.
const nums = [45, 4, 9, 16, 25];
const newNums = nums.map((item, index) => {
if(index < nums.length - 1) {
return item + nums[ index + 1]
}
return item + nums[0]
})
console.log(newNums) // [ 49, 13, 25, 41, 70 ]