How could you split a string into an array while keeping the separating string?
You can split a string by doing this but it doesn't keep the separator substring:
"My-Name".components(separatedBy: "-") -> ["My", "Name"]
This is what I'm trying to achieve:
Ex 1: "My-Name".someSplitFunc(separatedBy: "-") -> ["My-", "Name"]
Ex 2: "This-is-a-sentence".someSplitFunc(separatedBy: "-") -> ["This-", "is-", "a-", "sentence"]
You can try this:
var str = "This-is-a-sentence"
var separateList = str.components(separatedBy: "-")
for (index, _) in separateList.enumerated() {
if index < separateList.count - 1 {
separateList[index].append("-")
}
}
print(separateList)
[""] is the original string is empty.for index in separateList.indices.dropLast() {Simply use this extension below.
extension String {
func componentSeparate(by: String) -> [String] {
var out: [String] = [String]()
var storeStr = ""
for str in Array(self) {
if by.contains(str) {
out.append(storeStr)
storeStr.removeAll()
continue
}
storeStr.append(str)
}
return out
}
func componentSeparated1(by: String) -> [String] {
var separateList: [String] = componentSeparate(by: by).map { "\($0)\(by)" }
separateList[separateList.count-1].removeLast(by.count)
return separateList
}
func componentSeparated2(by: String) -> [String] {
if self.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty { return [] }
var separateList: [String] = componentSeparate(by: by).map { "\($0)\(by)" }
separateList[separateList.count-1].removeLast(by.count)
return separateList
}
func componentSeparated3(by: String) -> [String] {
if self.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty { return [] }
var separateList: [String] = componentSeparate(by: by).map {"\($0)\(by)"}.filter {$0 != "-"}
separateList[separateList.count-1].removeLast(by.count)
return separateList
}
func componentSeparated4(by: String) -> [String] {
if self.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty { return [] }
let separateList: [String] = componentSeparate(by: by).map {"\($0)\(by)"}.filter {$0 != "-"}
return separateList
}
}
print("This-is-a-sentence-".componentSeparated1(by: "-"))
print("".componentSeparated2(by: "-"))
print("This-is-a-sentence-".componentSeparated3(by: "-"))
print("This-is-a-sentence-".componentSeparated4(by: "-"))
Output:
["This-", "is-", "a-", "sentence-", ""]
[]
["This-", "is-", "a-", "sentence"]
["This-", "is-", "a-", "sentence-"]
components(separatedBy:) is a Foundation method. Not native Swift. It probably doesn't matter to the OP but it is worth mentioning for future readers. BTW None of your methods returns ["This-", "is-", "a-", "sentence-"]