.map(item => Object.assign({}, item))

This code creates a new array of objects with the same properties and values as the original array, using the `map()` method and `Object.assign()` function.

`map()` is a higher-order function that calls a provided function on every element of an array, and returns a new array with the results. In this case, the provided function is an arrow function that takes a single parameter `item`, which represents each element of the original array.

`Object.assign()` is a built-in JavaScript function that copies the values of all enumerable properties from one or more source objects to a target object. Here, it is used to create a new object that is a copy of the original `item` object.

However, since JavaScript objects are reference types, simply copying an object using `Object.assign()` creates a shallow copy, meaning that any changes made to the new object will also affect the original object. To create a deep copy of each object in the array, `Object.assign()` is used in conjunction with an empty object (`{}`), which creates a new object that is completely separate from the original object.