Iterator.concat()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.iteratorsIteratorsnewly2026-03-24https://tc39.es/ecma262/multipage/control-abstraction-objects.html#sec-iterator.concathttps://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Iterator/concatjavascript.builtins.Iterator.concathttps://nowyoucanuse.com/features--iterator-concat.html