Add a new property to every object in a list

addProperty.js

function addProperty(objList, newProperty) {
  return objList.map((obj) => ({
    ...obj,
    ...newProperty,
  }));
}

// use case
const sectionList = [
  {
    title: 'title 1', 
    text: 'text 1'
  },
  {
    title: 'title 1', 
    text: 'text 1'
  }
];

addProperty(sectionList, {expanded: false});