JS Practice — Built-in Objects

String.prototype.concat() — coerces non-strings

📖 Usage Example

const str = 'Hello'
str.concat(', ', 'World', '!')   // → 'Hello, World!'
''.concat('a', 'b', 'c')          // → 'abc'

Use concat() to join two or more strings together, returning a new string without modifying the originals.

String.prototype.concat() — Type Coercion

.concat() coerces non-string arguments to strings, similar to the + operator.

Challenge: Implement appendNumber(str, n) that concatenates a string and a number using .concat().

appendNumber('score: ', 42) // → 'score: 42'

💡 Hints (1)