how do I convert this for to swift 3

Question

How do I convert this for block to swift 3

let row = textField.tag
if row >= arrayOfLinks.count {
   for var addRow = arrayOfLinks.count; addRow <= row; addRow += 1 {
       arrayOfLinks.append("")
   }
}

Thanks

http://stackoverflow.com/questions/36173379/warning-c-style-for-statement-is-deprecated-and-will-be-removed-in-a-future-ve/36173489#36173489 — Bhavin Bhadani, Jan 03 '17 at 13:06

vadian · Accepted Answer · 2017-01-03T14:43:01.273

2

A C-style for loop is not needed at all

let row = textField.tag
while arrayOfLinks.count <= row {
    arrayOfLinks.append("")
}

edited Jan 03 '17 at 14:43

answered Jan 03 '17 at 13:09

vadian

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Note that the OPs original solution (intentional or not ...) appends a final element also when `arrayOfLinks.count` equals `row`, i.e., equivalent to using `<=` rather than `<` in the `while` loop termination condition above. – dfrib Jan 03 '17 at 14:38

score 0 · Answer 2 · edited Jan 03 '17 at 13:35

0

Try this:

let row = textField.tag
if row >= arrayOfLinks.count {
   var addRow = arrayOfLinks.count
   while addRow <= row {
       arrayOfLinks.append("")
       addRow += 1
   }
}

edited Jan 03 '17 at 13:35

MarmiK

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answered Jan 03 '17 at 13:01

Emil Laine

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score 0 · Answer 3 · answered Jan 03 '17 at 14:36

Since you repeatedly append the same (value) element, you needn't use a loop here, but can simply append a collection to the existing arrayOfLinks array:

if arrayOfLinks.count <= row {
    arrayOfLinks.append(contentsOf:
        [String](repeating: "", count: row - arrayOfLinks.count + 1))
}

This should also be more performant than repeatedly appending (same value) elements, not that this should be an issue, however.

Note also that (as per your original solution), a row value of e.g. 10 will yield a total (existing + new) of 11 elements in the numberOfEntries array.

how do I convert this for to swift 3

3 Answers3