如何按照包含每个对象中存在的属性的唯一值的另一个数组的顺序对对象数组进行排序？

Question

I have have two arrays, I want to merge them into one object. I have given some examples of what I have and what I want to achieve. I tried _.union and few other underscore methods.

var original = [
  {
    Country: 'US',
    value: '10'
  },
  {
    Country: 'Turkey',
    value: '5'
  }
];

var newlist =["Afghanistan", "Antarctica","Turkey"]

The Results I want:

var results= [
  {
    Country: 'Afghanistan',
    value: '0'
  },
  {
    Country: 'Antarctica',
    value: '0'
  },
  {
    Country: 'Turkey',
    value: '5'
  }
];

The US would not appear in the final results because the newlist doesn't have US. So basically all the values from the new list would appear in the results with the values from the original list.

Answer 1

A non-Underscore solution, that .map() s the new array, returning the object from the original array if it can .find() it, otherwise returning a new object:

 var original = [ { Country: 'US', value: '10' }, { Country: 'Turkey', value: '5' } ]; var newlist =["Afghanistan", "Antarctica","Turkey"] var result = newlist.map(function(v) { return original.find(function(o) { return o.Country === v }) || { Country: v, value: '0' } }) console.log(result) 

It's a one-liner with ES6 arrow functions:

 var original = [ { Country: 'US', value: '10' }, { Country: 'Turkey', value: '5' } ]; var newlist =["Afghanistan", "Antarctica","Turkey"] var result = newlist.map(v => original.find(o => o.Country===v) || {Country:v, value:'0'}) console.log(result)