Filter and sort swift array

Question

I have a swift array which I want to filter, here is the array

let array = [apple,workshops,shopping,sports,parties,pantry,pen] 

I want to filt

Answer 1

You can just write

 let result = words
    .filter { $0.contains(keyword) }
    .sorted { ($0.hasPrefix(keyword) ? 0 : 1) < ($1.hasPrefix(keyword) ? 0 : 1) }

Example

let words = ["apple", "workshops", "shopping", "sports", "parties", "pantry", "pen", "cat", "house"]
let keyword = "p"
let result = words
    .filter { $0.contains(keyword) }
    .sorted { ($0.hasPrefix(keyword) ? 0 : 1) < ($1.hasPrefix(keyword) ? 0 : 1) }

// ["pen", "pantry", "parties", "apple", "workshops", "shopping", "sports"]

Answer 2

Try this. Firstly, it filters the array to remove those elements that do not contain the search string, then uses a custom sort to prefer items that start with the search string. In general, use the Cartesian approach of splitting a problem into smaller sub-problems, rather than try to solve it all in one step.

let searchString = "p"
let array = ["apple", "workshops", "shopping", "sports", "parties", "pantry", "pen", "xyzzy"]

let filteredArray = array.filter({ $0.contains(searchString) })
filteredArray // drops xyzzy

let sortedArray = filteredArray.sorted(isOrderedBefore:  {
    switch ($0.hasPrefix(searchString), $1.hasPrefix(searchString)) {
    case (true, true):
        return $0 < $1
    case (true, false):
        return true
    case (false, true):
        return false
    case (false, false):
        return $0 < $1
    }

})
sortedArray // "pantry", "parties", "pen", "apple", "shopping", "sports", "workshops"] as required

Answer 3

Another way:

let searchString = "p"
let array = ["apple", "workshops", "shopping", "sports", "parties", "pantry", "pen", "xyzzy"]
let result = array.filter{$0.containsString(searchString)}
    .map{($0.hasPrefix(searchString) ? 0 : 1, $0)}
    .sort{$0 < $1}
    .map{$1}
print(result) //->["pantry", "parties", "pen", "apple", "shopping", "sports", "workshops"]

(I don't know why, but my Xcode took huge time to compile these lines. Believe this compiles and runs as expected eventually.)