JSFiddle - React, Tailwind, and code Playground

JavaScript

var items = []

function addRow(value) {
  var row = {
    value: value,
    index: items.length
  }
  items.push(row)
}

addRow(123);
addRow(456);
addRow(789);
console.log([...items]);

items.splice(1, 1)

addRow(321);
console.log(items);