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Peter Bozic
453 Pointsstuck and I don't know why?
Hi, I tried let item = todo.removeAtIndex(2) and als
let item = todo.removeLast and I'm not sure what's wrong with this code? thanks
var todo = ["Learn Swift", "Build App", "Deploy App"]
todo.append("Debug App")
todo.append("Fix Bugs")
todo
let item = todo.removeAtIndex(2)
item
3 Answers
Robert Richey
Courses Plus Student 16,352 PointsHi Peter,
You're doing great :)
On task 2 / 3, when I use your code, I get the following compiler error - which you can also see by click the preview button.
swift_lint.swift:7:1: error: expression resolves to an unused l-value
todo
^~~~
var todo = ["Learn Swift", "Build App", "Deploy App"]
todo.append("Debug App")
todo.append("Fix Bugs")
todo // the compiler is complaining about this line. it doesn't know what you're trying to do with todo.
let item = todo.removeAtIndex(2)
item // this line will be another similar error as above
After removing those two lines, the code will pass and you'll get to task 3 / 3.
Cheers
Peter Bozic
453 PointsHi Robert Thanks for your help and encouragement! I wrote 'todo' and 'item' thinking that this is what's required to CALL the preceding code. I've come across the term 'call' a few times and I thought I've seen it in the current video. Clearly I'm not sure what I'm doing. Thanks again and good night from this part of the world. cheers
Robert Richey
Courses Plus Student 16,352 PointsYou've been calling methods all along and may not have realized it.
Each time you write .append(), you're calling the 'append' method. Same with .removeAtIndex().
The variable todo is an object holding an array. Because it contains an array, you can call array methods on todo like 'append' and 'removeAtIndex'.
Just to recap, when told to call 'append' on 'todo', this works because 'append' is a method that works on arrays, and 'todo' contains an array.
Hope that helps,
Cheers
Peter Bozic
453 PointsYes, great explanations that really help a newbie a lot. It will take some time to sink in but I'm starting to get the picture bit by bit. I'm finding this forum and people like yourself of great value. Thanks again!