convert population json

gistfile1.txt

const fs = require('fs');

let population = JSON.parse(fs.readFileSync('population.json','utf8'));
population = population.filter(c =>  c.Year == "2016");
population = population.map(c=> {return {code3:c['Country Code'],population:c.Value}});

population = population.filter(c => c  != null);
let country3to2 = JSON.parse(fs.readFileSync('3to2countrycode.json','utf8'));
population = population.filter(c => c  != null);
population = population.map(c=> { 
    let code2obj = country3to2.find(cc =>  cc['alpha-3'] == c.code3);
    if (code2obj){
    return {
        code3: c.code3,
        population: c.population,
        code2: code2obj['alpha-2']

     }
    }
});
population = population.filter(c => c  != null);

population = population.map(c => {
      if (c) {
        let obj = {};
        obj[c.code2] = c.population;
        return obj;
    }
})

fs.writeFile('CountriesForGithub.json',JSON.stringify(population),() => {
    console.log("done");
})

console.log(population);