What's the best way to combine two simple JavaScript object properties?

Other Questions JavaScript
1

I’m working on a project where I need to join two basic JavaScript objects. Here’s what I’m trying to do:

let firstObj = { drink: 'coffee', book: 'novel' }
let secondObj = { music: 'rock' }

// I want to add secondObj properties to firstObj
// So firstObj would have drink, book, and music

Is there an easy way to do this in JavaScript? I don’t need anything fancy like deep merging or dealing with functions. Just want to combine the properties of these flat objects. Any help would be great!

2

hey, have u tried using the spread operator? its pretty cool. just do something like this:

let newObj = {…firstObj, …secondObj}

super easy and works great for simple objects like yours. its my fav way to combine stuff quick

3

I’ve found that using the spread operator (…) is a really elegant way to combine objects in JavaScript. It’s become my go-to method since it’s so clean and readable. Here’s how you could use it for your case:

let combinedObj = { ...firstObj, ...secondObj };

This creates a new object with all the properties from both firstObj and secondObj. It’s super intuitive and works great for flat objects like yours. One thing to keep in mind is that if there are any overlapping keys, the values from the rightmost object (secondObj in this case) will take precedence.

I’ve used this method in several projects and it’s always worked like a charm. It’s especially handy when you’re dealing with state updates in React or similar frameworks. Just remember, for more complex merging scenarios, you might need to look into deeper merging solutions.

4

For simple object merging like this, the Object.assign() method is your best bet. It’s straightforward and does exactly what you need. Here’s how you’d use it:

Object.assign(firstObj, secondObj);

This will add all properties from secondObj to firstObj. If you want to create a new object instead of modifying firstObj, you can do:

let combinedObj = Object.assign({}, firstObj, secondObj);

This creates a new object with properties from both. It’s clean, efficient, and works well for flat objects. Just remember, if there are matching keys, the values from the rightmost object will overwrite the others.