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

Tom Price
Tom Price
5,670 Points
Posted by Tom Price
Tom Price
5,670 Points

Concatenation - which order is better?

Hi. The following sets of code both produce the same result, so I was just wondering if there were any advantages to ordering the code one way or the other. Not a big issue, but I was just curious.

var visitorName = prompt("What is your name?");
var message = ("Hello ");
document.write (message + visitorName);

var visitorName = prompt("What is your name?");
var message = ("Hello " + visitorName);
document.write (message);

1 Answer

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

I'd say there's a slight advantage to the latter because you construct the entire message in the message variable. BTW, you don't need those parentheses around the right side of the assignments.

But since you probably don't need to retain the message anyway anyway, I'd probably not bother to create the variable and just do this:

var visitorName = prompt("What is your name?");
document.write("Hello " + visitorName);
Tom Price
Tom Price
5,670 Points
Tom Price
Tom Price
5,670 Points

Thank you, Steven! That clarifies things a bit.