React

React

function point(x,y){
  return {x,y}
}

arr1 = [point(1,2), point(3,4)];
console.log("arr1 closed", arr1);
console.log("arr1 opened:", arr1[0], arr1[1]);

arr1[0] = {x: 15, y:42};
console.log("arr1 closed", arr1);
console.log("arr1 opened:", arr1[0], arr1[1]);