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Find most used values in JSON file with Javascript


var countries = {};

for (i = 0; i < postObject.mediaPosts.length;
i++) {
    var country =
postObject.mediaPosts[i].country;
    countries[country] = countries[country] ?
countries[country] + 1 : 1
}

then you will have an object (an associative array) of the countries as keys, and their count in the input object. Something like this:

countries = {
    "Afghanistan" : 5,
    "Albania" : 3,
    "Bulgaria" : 2,
    //... the other countries
}

From there you can loop over it and create pairs from it

var countryCountPairs = {};

for (country in countries) {
    countryCountPairs.push({country : country, 
count : countries[country]});
}

Which will get you a data structure like this:

countryCountPairs = {
    { country : "Afghanistan",  count : 5 },
    { country : "Albania",  count : 3 },
    { country : "Bulgaria",  count : 2 },
    //... the other countries
}

And that is easily sortable:

countryCountPairs.sort(function(a, b) {
    // I think biggest value comes first with
this, but you will have to test it. 
    return b.count - a.count;  
});

Which will give you a sorted version of the above.


Categories : Javascript

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