JSFiddle - React, Tailwind, and code Playground

JavaScript

var populated = [
    Tokio = {"popul" : 37555},
    Jakarta = {"popul" : 29959},
    Deli = {"popul": 24134}
];


function min(purpose) {
    for (var i = 0; i < purpose.length; i++) {
        var k = 0;
        
        for (var key in purpose[k]) {
            if (purpose[i].key > purpose[k].key) {
                a = purpose[k];
                purpose[k] = purpose[i];
                purpose[i] = a;
            };
            k++;
        };
        
    };
    return purpose;
};

console.log(min(populated));