Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript Array Iteration Methods Combining Array Methods Working with Objects in Arrays

Kahriq Chatmon
Kahriq Chatmon
8,694 Points
Posted by Kahriq Chatmon
Kahriq Chatmon
8,694 Points

Arrow function syntax

Why does this work

const users = [
  {name: 'Samir', age: 27},
  {name: 'Angela', age: 33},
  {name: 'Beatrice', age: 42}
];

const noSamir = users.filter( (user) => user.name !== 'Samir' );

but this doesn't?

const users = [
  {name: 'Samir', age: 27},
  {name: 'Angela', age: 33},
  {name: 'Beatrice', age: 42}
];

const noSamir = users.filter( (user) => {user.name !== 'Samir'} );

I thought curly braces in arrow functions were optional?

1 Answer

Steven Parker
Steven Parker
229,695 Points
Steven Parker
Steven Parker
229,695 Points

The parentheses are optional if you have a single argument. But when you use braces for the body, you need complete statement(s), not just an expression:

const noSamir = users.filter(user => { return user.name !== "Samir"; });