Spot the Differences.js

/*
Description:
This kata is part of the collection Mary's Puzzle Books.

Mary brought home a "spot the differences" book. The book is full of a bunch of problems, and each problem consists of two strings that are similar. However, in each string there are a few characters that are different. An example puzzle from her book is:

String 1: "abcdefg"
String 2: "abcqetg"
Notice how the "d" from String 1 has become a "q" in String 2, and "f" from String 1 has become a "t" in String 2.

It's your job to help Mary solve the puzzles. Write a program spot_diff/Spot that will compare the two strings and return a list with the positions where the two strings differ. In the example above, your program should return [3, 5] because String 1 is different from String 2 at positions 3 and 5.

NOTES:

• If both strings are the same, return []

• Both strings will always be the same length

• Capitalization and punctuation matter
*/

function spot(s1,s2){
  const arr=[];
  s1.split('').map((v,i)=>v!=s2[i]?arr.push(i):v)
  return arr
}