JSFiddle - React, Tailwind, and code Playground

JavaScript

console.log(this === window); // true
var Weather = function () {
	var unit = 'metric';
	this.city = 'Salem';
	this.getCity = function () {
		console.log(this.city);
	};
};
var report = new Weather();
console.log(report.city);
report.getCity();
report.getCity.call({city : 'Portland'});