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 Arrays Loop Through Arrays Array Methods

How to write an Array Method with Join

Is this how you write an Array method with Join?

const planets = ['Earth','Mars','Saturn','Mercury','Jupiter','Venus','Uranus','Neptune'];
planets.join(', ');

1 Answer

Jeff Muday
Jeff Muday
Treehouse Moderator 28,716 Points

Yes, you are correct. Thejoin method of the list does return a string that is a joining or concatenation of the list. However, your console.log() is blank, although you may have meant it to be like that.

You may want to capture the output of the join into another variable and log the output.

const planets = ['Earth','Mars','Saturn','Mercury','Jupiter','Venus','Uranus','Neptune'];

// the method of 'join' being captured into a variable
const planetsString = planets.join(', ');

// the original

// the joined string