I was trying to converting a string into an array of numbers. The string is from a linked list and I want to get the numbers in the string without accessing the actual nodes.

here is my code:

list.append(value: 1)
list.append(value: 80)
list.append(value: 3)
list.append(value: 7)

var numbers = list.description.compactMap{$0.wholeNumberValue}

it outputs :

[1, 8, 0, 3, 7]

I want it to outputs like this:

[1, 80, 3, 7]

But I have no idea how to do it

CodePudding user response：

What you are trying to do is impossible.

list is a String. So, after you append the numbers it looks like this:

"18037"

There is no way to know that it was originally made from [1, 80, 3, 7]. It could have been [180, 37] or [18, 0, 37]

You haven't explained why you want to do this, but I would suggest either

1. Not using a string to store the values. In your case, use an Array<Int>
2. If you have to use a string, use a delimiter between the values, so that you end up with "1,80,3,7" instead and then you can parse them. (see components(separatedBy:))

CodePudding user response：

Hello Use Only map function to convert Int array to String :----

var list = [Int]()

list.append(1)
list.append(80)
list.append(3)
list.append(7)

var numbersString = list.map { String($0) }
        
print(numbersString)

Output :--- ["1", "80", "3", "7"]