Efficient Removal of Properties from Array of Objects

When dealing with an array containing multiple objects, it's necessary to remove specific properties from each object. While a straightforward approach using a for loop can suffice, exploring alternative methods that leverage ES6 features and prototype manipulation can lead to more efficient implementations.

ES6 Object Deconstruction

One such technique is object destructuring, introduced in ES6. It enables the extraction of specific properties from an object and further assignment to new variables. In the case of removing unwanted properties, this approach becomes particularly useful.

Consider the following example:

const array = [
  { bad: "something", good: "something" },
  { bad: "something", good: "something" }
];

To remove the "bad" property from each object, we can utilize the following code using ES6 destructuring:

const newArray = array.map(({ dropAttr1, dropAttr2, ...keepAttrs }) => keepAttrs);

In this code:

• The map method is employed to iterate over each object in the original array.
• Within the callback function, object destructuring is performed using the ellipsis syntax (...) to capture all properties that should be preserved in the new object (keepAttrs).
• The dropAttr1 and dropAttr2 variables serve as placeholders for any other properties you wish to exclude.

Advantages of ES6 Object Deconstruction

• Performance: Object destructuring is highly efficient as it avoids the overhead of using a for loop and directly assigns values to the required variables.
• Conciseness: The code is significantly shorter and cleaner compared to a for loop-based approach, enhancing readability and maintainability.
• Extensibility: As new properties are added to the objects in the array in the future, the code will automatically exclude them from the destructuring process, ensuring proper functionality.