61     // 9. Let first be the code unit value at index position in s.  in Next()
62     uint16_t first = EcmaStringAccessor(string.GetObject<EcmaString>()).Get<false>(position);  in Next()  local
65 …// 10. If first < 0xD800 or first > 0xDBFF or position+1 = len, let resultString be the string con…  in Next()
66     // single code unit first.  in Next()
68     if (position + 1 == len || first < base::utf_helper::DECODE_LEAD_LOW ||  in Next()
69         first > base::utf_helper::DECODE_LEAD_HIGH) {  in Next()
70         std::vector<uint16_t> resultString {first, 0x0};  in Next()
76         // first.  in Next()
77 …// c. Else, let resultString be the string consisting of the code unit first followed by the code …  in Next()
80             std::vector<uint16_t> resultString {first, 0x0};  in Next()
83             std::vector<uint16_t> resultString {first, second, 0x0};  in Next()