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iOS Swift Basics (retired) Collections Modifying an Array

Posted by Daniel Smith
Daniel Smith
674 Points

Insert a new item titled "Learn iOS" at the second position in the todo array. No example given to complete this, help

How do I insert into the array? No example given

arrays.swift 
var todo = ["Learn Swift", "Build App", "Deploy App"]
todo.append("Debug App")
todo.append("Fix Bugs")
let item = todo.removeAtIndex(2)

2 Answers

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

Amit goes over the insert method at 7:32 of this video. you may want to go back and review that part.

here is an example of how to use the insert method

myArray.insert("This String", atIndex: 0)

it takes two arguments, the value you want to insert, and the index where you want to insert it.

in your case, you want to insert "Learn iOS" at the second position in the string, which is index 1:

todo.insert("Learn iOS", atIndex: 1)
Daniel Smith
Daniel Smith
674 Points

Thank you!

Tom Ridley
Tom Ridley
3,673 Points
Tom Ridley
Tom Ridley
3,673 Points

You need to specify the index where you want to add the item. The following is taken from the swift documentation

var array = [1, 2, 3]
array.insert(0, atIndex: 0)
// array is [0, 1, 2, 3]

In you example to insert "Learn iOS" at the position 2 you write the following:

todo.insert("Learn iOS", atIndex: 1)

remember that the second item is at index 1 because arrays count from 0.

Daniel Smith
Daniel Smith
674 Points

Thank you!