JSFiddle - React, Tailwind, and code Playground

HTML

<button onclick="addTaste()">
  Add taste
</button>

JavaScript

var fruits = [
	{name:"apple", stock:"1box"},
  {name:"banana", stock:"2box"},
  {name:"banana", stock:"3box"}
];

function addTaste() {
	fruits.forEach(fruit => {
  	fruit.taste = 'good';
  });
  
  console.log(fruits);
}