Actually, wrapping the code in {} does make a difference with 'let'. A 'let' in braces does not escape the braces.

Well, the "let" keyword still doesn't work on any major browser so is like it doesn't even exist yet.

"let" has worked in Firefox for years; support for it first shipped in Firefox 2 back in 2006. You do have to opt in to it by putting type="application/javascript;version=1.7" on your script tag, since the feature is not backwards-compatible and hence couldn't be added to existing scripts without possibly breaking them.

JS 1.7 in general added a bunch of neat features (array comprehensions, destructuring assignment, etc) that are only now slowly making their way to specifications after some foot-dragging by certain parties. See https://developer.mozilla.org/en/JavaScript/New_in_JavaScrip...

Yeah, where right now you must use a self-invoking function, the let keyword would imitate that behavior with just {}'s. Less typing.

The only difference is there's no way to return a value from the blocks because this: var name = { return 'Awesome' }

...wouldn't work because, besides return being only for functions, when you use the = it assumes an object literal and throws a syntax error.