Iterator.concat()
Newly Available (since 2026-03-24)
Expected to be Widely Available on 2028-09-24
The Iterator.concat() JavaScript method returns an iterator that yields values from a sequence of iterators, exhausting each iterator before moving on to the next.
Browser support
- Chrome 146 Released on 2026-03-10
- Chrome Android 146 Released on 2026-03-10
- Edge 146 Released on 2026-03-13
- Firefox 147 Released on 2026-01-13
- Firefox for Android 147 Released on 2026-01-13
- Safari 26.4 Released on 2026-03-24
- Safari on iOS 26.4 Released on 2026-03-24
MDN documentation
Specifications
- ECMAScript® 2027 Language Specification (#sec-iterator.concat), from TC39 (Ecma International).
View as JSON | Edit this feature | Report an issue | Web-features entry: source, dist