How To Concatenate Properties From Multiple Javascript Objects

When you’re working on a project and need to combine properties from different objects in JavaScript, one handy technique you can use is called concatenating properties. This method allows you to merge the properties of multiple objects into one unified object. In this article, we’ll guide you through how to concatenate properties from multiple JavaScript objects in a few simple steps.

To begin, let’s create three JavaScript objects, each with its own set of properties:

const obj1 = {
  name: 'Alice',
  age: 30
};

const obj2 = {
  city: 'New York'
};

const obj3 = {
  profession: 'Engineer'
};

Now, let's say we want to merge these three objects into a single object that contains all their properties. To achieve this, we can use the `Object.assign()` method in JavaScript, which allows us to copy the values of all enumerable properties from one or more source objects to a target object.

Here’s how you can concatenate the properties from the `obj1`, `obj2`, and `obj3` objects into a new object:

const concatenatedObject = Object.assign({}, obj1, obj2, obj3);
console.log(concatenatedObject);

In this example, the `Object.assign()` method takes an empty object `{}` as the target object, followed by the objects `obj1`, `obj2`, and `obj3` as the source objects. The method then copies all the properties from these source objects into the target object `concatenatedObject`.

After running this code snippet, you’ll see the merged object logged to the console, containing all the properties from the original objects:

{
  name: 'Alice',
  age: 30,
  city: 'New York',
  profession: 'Engineer'
}

It’s important to note that the `Object.assign()` method creates a shallow copy of the source objects. This means that it only copies the object's properties directly, and if the property values are objects themselves, they will be referenced in the new object and not deep-copied.

If you want to concatenate properties from multiple objects while preserving the original objects, you can create a new object and define the properties manually. Here is an example:

const combinedObject = {
  ...obj1,
  ...obj2,
  ...obj3
};
console.log(combinedObject);

By using the spread operator `{ ... }`, we can merge the properties of `obj1`, `obj2`, and `obj3` into a new object `combinedObject`. This method gives you more control over which properties to include and allows you to retain the original objects for future use.

In conclusion, concatenating properties from multiple JavaScript objects is a useful technique when you need to consolidate data from various sources. Whether you prefer using `Object.assign()` for a shallow copy or the spread operator for more flexibility, mastering this skill will come in handy in your coding adventures. Experiment with different scenarios and explore the possibilities of merging objects in JavaScript to enhance your development skills. Happy coding!