JavaScript 코드 세그먼트: ("/", "-", "등"이후에 트레일러 정보 가져오기

const test1 = "/shopify/php-programmer-4781"
const test2 = "/shopify/rails/1351"

function getTrailingId(punctuation, str)  {
    const trailingId = str.substr(str.lastIndexOf(punctuation) + 1)
    return trailingId
}

getTrailingId("-", test1) // 4781
getTrailingId("/", test2) // 1351

const test1 : string = "/shopify/php-programmer-4781"
const test2 : string = "/shopify/rails/1351"

function getTrailingId(punctuation: string, str: string) : string {
   const trailingId : string = str.substr(str.lastIndexOf(punctuation) + 1)
   return trailingId
}

getTrailingId("-", test1) // 4781
getTrailingId("/", test2) // 1351