I want to show average of population of all the countries. I am trying to create one array from mapped data and then get average. I don't know how to create one array from the data. Or is there other way of doing it?
code:
function getAverage(countries) {
countries.map((country) => {
const countryPopulation = country.population;
console.log(countryPopulation);
return countryPopulation;
});
}
This it what I get from console.log(countries.population) :
use reduce to sum up all the populations, and divide by the number of countries to get an average. Theres no need to make a separate array to do this.
function getAverage(countries) {
const sum = countries.reduce((acc, country) => acc + country.population,0);
return sum/countries.length;
}
If you want to create an array just to get average, there is a better way of doing it, here is my goto one liner to calculate average of arguments
const average = (...args) => args.reduce((a, b) => a + b) / args.length
.mapreturns the array you’re looking for. Log that result, not the individualcountryPopulationvalues. Just look at the examples in the documentation.