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Object.assign() vs. Object spread operator

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March 14th, 2024

Coding, especially when working with javascript, managing and handling objects is a key skill. Think of objects like boxes that hold different things. These “things” can be numbers, words, or even actions in JavaScript. Now, two main ways to handle these boxes and rearrange or combine their contents are Object.assign() and another method that involves spreading objects out, the object spread operator.


Imagine you have two boxes of crayons. One box has basic colors like red, blue, and yellow. The other box has special colors like glitter, gold, and neon pink. Now, you want to combine all these crayons into one big box to use all the colors together. In the computer coding world, Object.assign() does exactly this with objects.

Object.assign() is a way to take everything from one or more objects and put it into a new object. It’s like taking all the crayons out of their boxes and putting them into a new, bigger box. This is super handy when you want to mix things from different places into one.

But it’s not perfect. Sometimes, if two boxes have crayons of the same color, one color might cover the other in the big box. In coding, if two objects have the same thing, the last one you add will be the one that shows up.

Imagine you are using different types of phones and tablets to play a game. This is called mobile device fragmentation. Every device is a bit different, like having different colors of crayons. Object.assign() can help ensure the game works well on all devices by combining settings or rules into one big set that all devices can understand.

Object Spread Operator

Let’s talk about another cool tool called the object spread operator. Imagine you have a big piece of paper with drawings of stars, moons, and planets. You want to make a new piece of paper with all these drawings and some rockets and aliens. With the object spread operator, you can do just that! It lets you take all the drawings from the first piece of paper and spread them onto a new one. Then, you can add more drawings to it.

The object spread operator is like a magic trick for coders. It makes it super easy to mix things and add new things. It’s like saying, “I want everything from here and these new things.” This is useful because it’s simple and quick. But, just like with Object.assign(), if there are two drawings of the same star, the last one you add is the one you’ll see on your new piece of paper.

Using this operator is great when making apps because it helps keep the code clean and easy to read. Imagine you’re building a big puzzle, and this tool helps everyone see what pieces you’re adding and where they go.

For example, when making app development tools important to work fast and keep things simple. The object spread operator is like having a shortcut that saves time and makes the developer’s job easier. This way, they can focus on making the app amazing instead of getting stuck on tricky parts.

Comparative Analysis: Object.assign() vs. Object Spread Operator

Now that we understand both the Object.assign() and the object spread operator, let’s compare them. Think about two ways to fill a sandbox with toys. Object.assign() is like taking toys from different boxes and putting them into the sandbox individually. The object spread operator, however, is like pouring all the toys into the sandbox at once and then adding some more on top. Both ways fill the sandbox, but they do it differently.


It’s a bit like a race regarding how fast each method works. Sometimes, the Object.assign() vs. Object spread operator is faster, especially when dealing with many toys or, in coding terms, a big object. But other times, the object spread operator wins because it’s more straightforward to use in the code.


Imagine you have a copy machine that only copies the top sheet of a stack of drawings. Object.assign() and the object spread operator are like this machine. They only copy the stuff on the “top” of an object, not the hidden layers underneath. This is called “shallow copying.” You might need a different tool if you need to copy everything, even the layers underneath.


Think about video games. Some games can be played on very old consoles, while others need the newest console. Object.assign() vs. Object spread operator is like a game that can be played on more devices because it’s been around longer. The object spread operator is newer, so some older web browsers can’t use it without a little help from special coding tricks.

Choosing the right tool depends on your project, like picking the right toy for a game. The App Founders would look at what they need for their app, such as how fast it needs to run and what web browsers it should work on. They might choose Object.assign() vs. Object spread operator for some tasks and Object spread operator for others, depending on what’s best for their app.

Practical Applications in App Development

So, how do we use Object.assign() vs. Object spread operator and the object spread operator when making apps? Let’s imagine you’re creating a magical book app. This app needs to remember your favorite stories, the colors you like for the background, and the text size you find easiest to read.

Using Object.assign(), you could take your favorite stories from last year and add new ones you’ve discovered this year. This way, your app knows all the stories you love. It’s like updating your list of favorite ice cream flavors as you try new ones.

The object spread operator helps, too. Let’s say you want to add sparkles to the background of your app. With the spread operator, you can take the current settings of your app and spread them out, then add “sparkles: yes” to the mix. Now, your app remembers your stories and settings and adds those extra sparkles you wanted.

And when it comes to mobile app navigation, both tools come in handy. They can help make sure the buttons and menus in your app move you smoothly from one page to another, like a map that guides you through a treasure hunt. You can update the map with new paths or shortcuts, making exploring your app easier and more fun.

Using Object.assign()and the object spread operator, app makers can create a magical book app that feels personal and special to every reader. It’s like having a wizard’s wand that can change and update the app, ensuring it always fits what you like and how you want to use it.


Knowing when to use Object.assign() and when to use the object spread operator is like choosing the right tool for a job. Both have their special moments to shine, whether you’re updating an app with new features or making sure it runs smoothly on all devices. Just like choosing between a bike or a skateboard to get to the park, it’s all about picking the best option for your adventure.

Remember, whether working on a small project or building something big, understanding these tools can make your coding much easier and more fun. So, keep experimenting with Object.assign() and the object spread operator, and see all the amazing things you can create with them!

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