JSFiddle - React, Tailwind, and code Playground

JavaScript

var objMap = new Map(500,500);
        var myCities = objMap.genValues(5);

function Map(sizeX, sizeY) {
    this.sizeX = sizeX;
    this.sizeY = sizeY;
}
Map.prototype = {
    genValues: function (number) {
        validateValues();
    }
}

function validateValues(){
    alert('hi');
}