I want to perform an operation involving the current and the next array element.
For example, add current element with the next:
let arr = [0,1,2,3,4,5]; let newarr = arr.map((a,b) => a+b); //here, a and b are treated as the same element
expecting it to yield a new array of sums of current and next array element:
[0+1, 1+2, 2+3, 3+4, 4+5]
Is it possible to do that with map? If not, is there any other method that is suitable for manipulating multiple array elements in one operation?
here, a and b are treated as the same element
a is the value and
b is the index. They happen to be the same in your particular data set.
Is it possible to do that with map?
Not with map itself. That will give you a new value for each value in the array, but you are starting with 6 values and ending up with 5, so you need an additional transformation.
Obviously you also need to use “the next value” instead of “the current index” too.
const arr = [0,1,2,3,4,5]; const newarr = arr.map((value, index, array) => value + array[index + 1]); newarr.pop(); // Discard the last value (5 + undefined); console.log(newarr);