JS Practice — Built-in Objects

String.prototype.replaceAll() — vs replace (only first)

📖 Usage Example

'foo bar foo'.replaceAll('foo', 'baz')  // → 'baz bar baz'
'banana'.replaceAll('a', 'o')           // → 'bonono'

Use replaceAll() to replace every occurrence of a search string or regex (with /g flag) with the replacement.

replaceAll vs replace

.replace(str) only replaces the first match. .replaceAll(str) replaces all matches.

Challenge: Implement countReplacements(str, from, to) and show it replaces more than replace alone would.

'aaa'.replace('a', 'b')    // → 'baa'
'aaa'.replaceAll('a', 'b') // → 'bbb'

💡 Hints (2)