JavaScript Symbol type: (non-string object keys)

Question

What is the "Symbol" javascript type as mentioned in this ECMAScript 6 draft specification?

To quote the spec:

The Symbol type is the se

Answer 1

Symbol is a new addition to the language proposed as part of ECMAScript 6:

Current work on ECMAScript™

Work on future ECMAScript™ editions continues as part of the previously announced ECMAScript™ "Harmony" project. More details of the current work on ECMAScript "Harmony" are described on this Wiki. A sixth edition of the standard is currently under development with a target date of December 2013 for completion.