Node: Destructuring Assignment doesn't work in node v 4.1.0 for me

[andrew-medvedev]

This code:

function ololo() {
    return ['olo', 1337];
}

var [that, anotherOne] = ololo();

produces:

var [that, anotherOne] = ololo();
    ^

SyntaxError: Unexpected token [
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:413:25)
    at Object.Module._extensions..js (module.js:452:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:475:10)
    at startup (node.js:117:18)
    at node.js:951:3

[targos]

ES6 destructuring is not shipped yet in the V8 version that we have in node v4.
However you can make your sample work if you run node with the flag --harmony-destructuring. Be aware that this feature may have bugs or be incomplete (this is why it's behind a flag).

[andrew-medvedev]

Ok, thanks. When do you plan to ship full support of ES6 in node(if it is not a secret)?

[Trott]

@andrew-medvedev Most of the information you'd want about ES6 and Node can be found at https://nodejs.org/en/docs/es6/. In a nutshell, ES6 features aren't in Node core. They're in v8, the underlying JavaScript engine used by Chrome, Opera, and Node.js. So Node won't ship with a feature before v8 ships with it. Here's the v8 issue for the destructuring feature: https://code.google.com/p/v8/issues/detail?id=811

[andrew-medvedev]

@Trott Ty, it's now clear for me

[leonaves]

v8 shipped with this yesterday (bug closed 11 hours ago and now present in the canary build of chrome). What's the lead time on a node release using this version of v8?

[ChALkeR]

@leonaves According to chromestatus, this is fixed in v8 4.9.

According to the v8 4.9.x changelog, it's shipped by default in 4.9.295.

Node.js branch vee-eight-4.9 has V8 4.9.385.18.

You could help test that branch =). Does it work with your code?

[leonaves]

One way to find out I suppose...

[dman777]

I would like this very much. However, I do not want to compile node manually or use the nightly branch. How long until V8 4.9.385.18 is shipped with the stable node 4.*?

[evanlucas]

@dman777 that version of v8 will not ship with node 4.x. At least that version will ship in node v6.x.

[chandankrishnan]

i have got error in node-wit node-module
/app/node_modules/node-wit/lib/wit.js:18
const {
SyntaxError: Unexpected token {

also i run following command
node --harmony_destructuring /home/bridgeit/Documents/fundu-hr-backend/node_modules/node-wit

but give error "node: bad option: --harmony_destructuring" and i using node version 6.2.2 ,npm version 3.9.5 and node -p process.version.v8 is 5.0.71.52

[narg95]

with Node version 6.6.0 (not npm) works perfect for me without any flag.