Swift version: 5.6
Swift’s string have a built-in hasPrefix()
method that returns true if the string starts with specific letters, but they don’t have a way to remove those letters if they exist.
Fortunately, we can fill that gap with an extension on String
that combines hasPrefix()
with dropFirst()
, which will check whether the prefix exists and remove it in one go:
extension String {
func deletingPrefix(_ prefix: String) -> String {
guard self.hasPrefix(prefix) else { return self }
return String(self.dropFirst(prefix.count))
}
}
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Available from iOS 8.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
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