JS Practice — Built-in Objects

String.prototype.replace() — capture groups in replacement

📖 Usage Example

'foo bar foo'.replace('foo', 'baz')    // → 'baz bar foo'
'hello'.replace(/[aeiou]/g, '*')       // → 'h*ll*'

Use replace() to replace the first occurrence of a pattern; use a /g regex to replace all occurrences.

String.prototype.replace() — Capture Groups

Use $1, $2, etc. in the replacement string to reference captured groups.

Challenge: Implement swapWords(str) that swaps two space-separated words.

swapWords('hello world') // → 'world hello'

💡 Hints (2)