CODEWITHSUNDEEP
javascriptnode.jsreactjs
Ivan
Ivan

Reputation: 7746

Syntax error on async arrow function

I am following this example, but on this section of code...

const getApiAndEmit = async socket => {
  try {
    const res = await axios.get(
      "https://api.darksky.net/forecast/PUT_YOUR_API_KEY_HERE/43.7695,11.2558"
    ); // Getting the data from DarkSky
    socket.emit("FromAPI", res.data.currently.temperature); // Emitting a new message. It will be consumed by the client
  } catch (error) {
    console.error(`Error: ${error.code}`);
  }
};

I get the following error

D:\Documents\js\socketio-server\app.js:42
const getApiAndEmit = async socket => {
                        ^^^^^^
SyntaxError: Unexpected identifier
    at createScript (vm.js:56:10)
    at Object.runInThisContext (vm.js:97:10)
    at Module._compile (module.js:542:28)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:389:7)
    at startup (bootstrap_node.js:149:9)
PS D:\Documents\js\socketio-server>

Upvotes: 0

Views: 701

Answers (3)

sheepgobeep
sheepgobeep

Reputation: 783

The function syntax seems correct. You may need to update node, as async support didn't arrive until early this year (edit: version 7.6 after googling).

You can rewrite using promises or try the --harmony flag when running from the command line.

Upvotes: 1

raksa
raksa

Reputation: 938

should enclose function with parentheses ()

const getApiAndEmit = async (socket => {
  try {
    const res = await axios.get(
      "https://api.darksky.net/forecast/PUT_YOUR_API_KEY_HERE/43.7695,11.2558"
    ); // Getting the data from DarkSky
    socket.emit("FromAPI", res.data.currently.temperature); // Emitting a new message. It will be consumed by the client
  } catch (error) {
    console.error(`Error: ${error.code}`);
  }
});

Upvotes: 1

Soviut
Soviut

Reputation: 91545

You need to upgrade to node 7.6 (or higher) since the async keyword wasn't supported in earlier versions. As of right now, 6.11 is the LST version and 8.3 is the latest.

Upvotes: 0

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