JSFiddle - React, Tailwind, and code Playground

JavaScript

function food(price) {
  this.price = price || 100; 
}

var myFood = new food(100);

var foo = [];
var bar = [];
foo.push(myFood);
bar.push(myFood);

myFood.price = 50;

alert('' + foo[0].price + ', ' + bar[0].price);