A reusable rank normalizer. Should use with map. (Reminder. you may use a normal loop counter if you have just one place to use this)

static_normalizer.js

class rankNormalizer{
  static normalize(){
    rankNormalizer.count = typeof rankNormalizer.count !== 'undefined'?++rankNormalizer.count:1
    //console.log(rankNormalizer.count);
    return rankNormalizer.count;
  };
  static reset(){
    rankNormalizer.count=null
  }
}

rankNormalizer.normalize();// 1
rankNormalizer.normalize();// 2
rankNormalizer.normalize();// 3
rankNormalizer.reset();
rankNormalizer.normalize();// 1
rankNormalizer.normalize();// 2
rankNormalizer.normalize();// 3

However, you can do this in oneshot if you use sort() & keys() on an array. If it is an object array, use Lodash but use the same technique

x=[{ 'a': 1, 'b': 2 , c:3, d:4, e:5},{ 'a': 2, 'b': 3 , c:3, d:4, e:5},{ 'a': 6, 'b': 3 , c:3, d:4, e:5}]   y=_.keys(x);//it is array of strings: you may need to typecast in some cases.