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 trialJ Quinn
2,439 PointsHow do I use .unshift?
Trying to get "carrots" to front of the array. What am I doing wrong?
grocery_list = ["milk", "eggs", "bread", "carrots"]
grocery_list.unshift ("carrots")
1 Answer
Marco van Vemden
12,553 PointsHi J, The .unshift method adds a new item to the beginning of the array, but the method does not remove the last item from the array. You could use the .pop method for that. Here are two solutions that have the same output:
# Add to beginning, and remove last item
grocery_list = ["milk", "eggs", "bread", "carrots"]
grocery_list.unshift ("carrots")
grocery_list.pop()
puts grocery_list
# Rotate only the last element (-1), so it becomes first
grocery_list = ["milk", "eggs", "bread", "carrots"]
grocery_list.rotate!(-1)
puts grocery_list