ios - Use of rangeOfCharacter in Swift 3.0 -


i attempting use rangeofcharacter create app, unable understand documentation:

func rangeofcharacter(from: characterset, options:  string.compareoptions, range: range<string.index>?)  -finds , returns range in string of first character  given character set found in given range given options.

documentation link: https://developer.apple.com/documentation/swift/string#symbols

i working on exercise create function take in name , return name, minus consonants before first vowel. name should returned unchanged if there no consonants before first vowel.

below code have far:

func shortnamefromname(name: string) -> string {     var shortname = name.lowercased()     let vowels = "aeiou"     let vowelrange = characterset(charactersin: vowels)     rangeofcharacter(from: vowels, options: shortname,                  range: substring(from: shortname[0]))

any appreciated. apologies newbie mistakes.

i hate swift ranges. things better swift 4.

let name = "michael" var shortname = name.lowercased() let vowels = "aeiou" let vowelset = characterset(charactersin: vowels)  let stringset = shortname if let range = stringset.rangeofcharacter(from: vowelset, options: string.compareoptions.caseinsensitive)  {     let startindex = range.lowerbound      let substring = name.substring(from: range.lowerbound)     print(substring) }

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