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

Can we supply a character for separating arrays in concat()?

Because in join we do:

join(', ');

As we can only put the name of the variable of the other array inside the parentheses of concat().

2 Answers

No, you cannot supply a character to separate the strings that you concatenate. The only parameters that String.concat() will take are the strings or arrays that you mean to concatenate.

String.prototype.concat(): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/concat

Array.prototype.concat(): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat

I see. Great! Thanks!

No problem!