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

Posted by sanjeshwari Nand
.a{fill-rule:evenodd;}techdegree
sanjeshwari Nand
Full Stack JavaScript Techdegree Student 4,673 Points

argument passed in the map function

regarding the below:

document.querySelector('body').innerHTML = planets.map(planet => createPlanetHTML(planet)).join('')

i dont understand this part : "planet =>" can you please explain why this is added on to the rest... createPlanetHTML(planet), so i can translate.

1 Answer

Steven Parker
Steven Parker
231,210 Points
Steven Parker
Steven Parker
231,210 Points

The "map" function takes a callback as an argument, and this syntax defines an anonymous function with a parameter named "planet" using arrow function syntax.

For more details, see the MDN page on Arrow function expressions.

sanjeshwari Nand
.a{fill-rule:evenodd;}techdegree
sanjeshwari Nand
Full Stack JavaScript Techdegree Student 4,673 Points

thank you !