arr.index(of:)
available only when Element conforms to Identifiable.
้็ถไธ้ข็ extension ไนๅฏไปฅ็จไธ้ข็่ชๆณไพไปฃๆฟ๏ผ
ไฝๅฆๆๅจๆพไธๅใไธๅฎๅฏๆพๅฐๅๅฏไธใ็ๆฑ่ฅฟๆ๏ผ็จ extension ็่ชๆณๆ่ผ็ฐกๆฝ๏ผ
ๆณจๆ๏ผๆๅๅจ index(of:) ๅพ้ขๅ ไธๅใ๏ผใ๏ผ่กจ็คบๆๅ็ขบๅฎ้ๆฏไธๅๅฏไปฅ็ตๅฐๆพๅฐ็ๆฑ่ฅฟ๏ผๅๆๅๆฒๆๅฟฝ็ฅ้ๅๅฝๆธๅๅณ็ๅ ถๅฏฆๆฏไธๅ Optinal<Int>ใ
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