JS Practice — Built-in Objects

String.fromCodePoint() — emoji / supplementary planes

📖 Usage Example

String.fromCodePoint(65)       // → 'A'
String.fromCodePoint(9731)     // → '☃'
String.fromCodePoint(128512)   // → '😀'

Use String.fromCodePoint() to create a string from Unicode code point values, including characters outside the BMP.

String.fromCodePoint() — Supplementary Characters

Code points above U+FFFF (like emoji) require two UTF-16 code units (a surrogate pair). String.fromCodePoint handles this automatically.

Challenge: Implement getEmoji() that returns the grinning face emoji '😀' using code point 128512.

getEmoji() // → '😀'

💡 Hints (2)

• Emoji like 😀 have code points > 65535 and are represented as surrogate pairs in UTF-16.
• `String.fromCodePoint(128512)` automatically generates the correct surrogate pair.