Welcome to the Treehouse Community
The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.
YI JIANG3,424 Points
The number was ' + randomNumber + '
I don't understand this part why ' put there? not here 'randomNumber'?
Rune Andreas Nielsen5,342 Points
The reason that you don't use ' between + and randomNumber, is that if u do that, the browser won't know it´s a variable, it would think it is a string.
When using the + symbol, the browser knows it´s job is to concatenate the variable with the string.
So lets say that you would write code like this:
var randomNumber = 10; alert('The number was ' + 'randomNumber' + '.')
Then the output would be "The number was randomNumber."
Using the syntax the video shows:
var randomNumber = 10; alert('The number was ' + randomNumber + '.')
The output will be "The number was 10."