mapMethodFunctionSolution.js

/*Given an input of an array of digits, return the array with each digit incremented by its position in the array: the first digit will be incremented by 1, the second digit by 2, etc. Make sure to start counting your positions from 1 ( and not 0 ).

Your result can only contain single digit numbers, so if adding a digit with its position gives you a multiple-digit number, only the last digit of the number should be returned.

Notes:
return an empty array if your array is empty
arrays will only contain numbers so don't worry about checking that
Examples:
[1, 2, 3]  -->  [2, 4, 6]   #  [1+1, 2+2, 3+3]

[4, 6, 9, 1, 3]  -->  [5, 8, 2, 5, 8]  #  [4+1, 6+2, 9+3, 1+4, 3+5]
                                       #  9+3 = 12  -->  2*/






function incrementer(nums) { 
    if(nums == []) return[]
    //guard clause
    return nums.map((n,i)=> (i + n + 1)%10)
  }