JSFiddle - React, Tailwind, and code Playground

JavaScript

//sort this
var data = [
    { count: '12', year: '1956' },
    { count: '1', year: '1971' },
    { count: '33', year: '1989' },
    { count: '33', year: '1988' }
];


data.sort(function(a, b) {
    // Sort by count
    var dCount = a.count - b.count;
    if(dCount) return dCount;

    // If there is a tie, sort by year
    var dYear = a.year - b.year;
    return dYear;
});

alert(JSON.stringify(data));