JS Practice — Built-in Objects

String.prototype.codePointAt() — basic ASCII

📖 Usage Example

const str = 'Hello'
str.codePointAt(0)     // → 72
'😀'.codePointAt(0)    // → 128512

Use codePointAt() to get the full Unicode code point at a position, correctly handling supplementary characters.

String.prototype.codePointAt()

str.codePointAt(pos) returns the Unicode code point value at the given position. For BMP characters it works just like .charCodeAt().

Challenge: Implement getCodePoint(str, pos) using .codePointAt().

getCodePoint('A', 0) // → 65
getCodePoint('a', 0) // → 97

💡 Hints (1)

• For BMP characters (code points ≤ 65535), `.codePointAt()` returns the same value as `.charCodeAt()`.