Summary & Key Takeaways ​

• Three new proposals have been promoted to TC39 Stage 4.
• Iterator.prototype.chunk() allows splitting an iterator into chunks of a specified size.
• Iterator.prototype.includes() checks if an iterator contains a specific value.
• Iterator.prototype.join() concatenates the string representations of an iterator's elements.
• These methods are now part of the official JavaScript standard.

Our Commentary ​

YES! More iterator methods are always a win for functional programming patterns in JavaScript. chunk() is something I've wanted for ages, and includes() and join() just make iterators feel more complete. This is a solid set of additions that will definitely streamline a lot of common data manipulation tasks.