JS Practice — Built-in Objects

String.prototype.matchAll() — named capture groups

📖 Usage Example

const str = 'a1 b2 c3'
const matches = [...str.matchAll(/(w)(d)/g)]
matches.length   // → 3
matches[0][1]    // → 'a'

Use matchAll() with the g flag to iterate over all regex matches and access capture groups in each result.

String.prototype.matchAll() — Named Groups

Named groups from each match are in match.groups.

Challenge: Implement extractKeyValues(str) that parses key=value pairs from a string.

extractKeyValues('a=1 b=2 c=3') // → [{ key: 'a', value: '1' }, ...]

💡 Hints (1)