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 filter the array in such a way that the items beginning with the search string to appear before items that just contain the search string
So when i search for example p, then the results should be in some way
let array = [parties,pantry,pen,apple,workshops,shopping,sports]
I tried this
tagSearchResults = tagSearchResults.filter({ (interestTag:InterestTag) -> Bool in
let tmp: NSString = interestTag.tag
let range = tmp.rangeOfString(searchText, options: NSStringCompareOptions.CaseInsensitiveSearch)
return range.location != NSNotFound
})
but this gives me all strings containing the search string.
So guys how can i do this
You can just write
let result = words
.filter { $0.contains(keyword) }
.sorted { ($0.hasPrefix(keyword) ? 0 : 1) < ($1.hasPrefix(keyword) ? 0 : 1) }
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"]
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
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.)
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