Iterator join()Limited availability
The join() method of an Iterator object returns a string concatenation of all the iterator's items, separated by commas or a given separator string. It's similar to the join() method of arrays.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–152Not supported
153+Supportedsince Sep 8, 2026
Current: 155Edge
12–152Not supported
153+Supportedsince Sep 11, 2026
Current: 154Firefox
1–153Not supported
154+Supportedsince Aug 18, 2026
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–152Not supported
153+Supportedsince Sep 8, 2026
Current: 155Firefox Android
4–153Not supported
154+Supportedsince Aug 18, 2026
Current: 157Safari iOS
✕Not supportedup to 27
Current: 27How to use
Not supported in Safari, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: join.
Feature detection
JS · check before using
if ("join" in Iterator || ("prototype" in Iterator && "join" in Iterator.prototype)) {
// Iterator.join is available
}