JS Practice — Built-in Objects

String.prototype.charAt() — first character

📖 Usage Example

const str = 'Hello'
str.charAt(0)    // → 'H'
str.charAt(1)    // → 'e'
str.charAt(99)   // → ''

Use charAt() to get the character at a specific index, returning an empty string for out-of-bounds positions.

String.prototype.charAt()

str.charAt(index) returns the character at the specified index, or an empty string '' for out-of-bounds (unlike .at() which returns undefined).

Challenge: Implement firstChar(str) that returns the first character using .charAt(0).

firstChar('hello') // → 'h'
firstChar('world') // → 'w'

💡 Hints (1)

• `str.charAt(0)` is equivalent to `str[0]` for most cases, but returns `""` instead of `undefined` for out-of-bounds.