JS Practice — Built-in Objects

String.prototype.padEnd() — fill string is truncated if needed

📖 Usage Example

'5'.padEnd(3, '0')       // → '500'
'hello'.padEnd(8, '-')   // → 'hello---'
'hi'.padEnd(2)           // → 'hi'

Use padEnd() to pad the end of a string with a fill character until it reaches the target length.

String.prototype.padEnd() — Truncated Fill

If the fill string is longer than needed, it is truncated.

'ab'.padEnd(5, 'XYZ') → 'abXYZ' (fill truncated to exactly fit) 'ab'.padEnd(6, 'XYZ') → 'abXYZX'

Challenge: Implement padPattern(str, len) that pads with '123'.

padPattern('ab', 7) // → 'ab12312'

💡 Hints (1)