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 React by Example Building the Application Removing Names From the List

Posted by shyarkhalil
.a{fill-rule:evenodd;}techdegree seal-36
shyarkhalil
Front End Web Development Techdegree Graduate 17,762 Points

Just wondering why Guil uses index + 1?

As I know that index indicates to the current item in the array but, what he does mean by + 1?

1 Answer

Clayton Perszyk
MOD
Clayton Perszyk
Treehouse Moderator 48,850 Points
Clayton Perszyk
Clayton Perszyk
Treehouse Moderator 48,850 Points 
let guests = ["tom", "dick", "jane", "louis", "dave"];
let guestsAfterSlicing = [];
let index = 2;
let firstHalf = guests.slice(0, index); // returns tom and dick, so everything from index 0 to index 2 (non-inclusive)
let secondHalf = guests.slice(index + 1); // returns louis and dave, so everything from index 3 to end of array

guestsAfterSlicing = firstHalf.concat(secondHalf);
console.log(guestsAfterSlicing); // returns ["tom", "dick", "louis", "dave"];

By performing the previous operations we have removed jane from the original guests array.

shyarkhalil
.a{fill-rule:evenodd;}techdegree seal-36
shyarkhalil
Front End Web Development Techdegree Graduate 17,762 Points

Thanks a lot!