JS Practice — Built-in Objects

String.fromCharCode() — round-trip with charCodeAt

📖 Usage Example

String.fromCharCode(65)        // → 'A'
String.fromCharCode(97)        // → 'a'
String.fromCharCode(72, 105)   // → 'Hi'

Use String.fromCharCode() to create a string from one or more UTF-16 char code values.

String.fromCharCode() — Round-trip

You can convert a char to its code with .charCodeAt(0), and back with String.fromCharCode.

Challenge: Implement shiftChar(ch, n) that shifts a character by n positions in the char code table.

shiftChar('A', 1) // → 'B'
shiftChar('a', 2) // → 'c'

💡 Hints (1)

• Use `ch.charCodeAt(0)` to get the code, then `String.fromCharCode(code + n)` to get the new char.