Javascript shallow copying example

shallow.js

// Example of updating record on shallow copied array in Javascript

const arr1 = [{a: 10, b: 15}];
console.log("arr1 before update = ", arr1);

const arr2 = arr1.slice();
console.log("arr2 before update = ", arr2);

arr2[0].b = 15;

console.log("arr2 after update = ", arr2);
console.log("arr1 after update = ", arr1);