Calling function in object in ES6

Question

Trying ES6 and came across this example:

var bob = {
      _name: "Bob",
      _friends: ["Pete", "Joe", "Larry"],
      printFriends() {
        this._friends.forEach(f =>
          console.log(this._name + " knows " + f));
      }
    }

Console logging bob.printFriends() gives undefined.

are you sure you're transpiling the code correctly? It's working for me esnextb.in/?gist=87892ce1aac47ec0ff90540d0c546345 — Mauricio Poppe
– Mauricio Poppe, Commented May 3, 2016 at 23:57
Well, printFriends does return undefined, so the result seems to be correct? — Felix Kling
– Felix Kling, Commented May 4, 2016 at 0:50

Mulan · Accepted Answer · 2016-05-04 00:02:58Z

1

Your code

var bob = {
  _name: "Bob",
  _friends: ["Pete", "Joe", "Larry"],
  printFriends() {
    this._friends.forEach(f =>
      console.log(this._name + " knows " + f));
  }
}
bob.printFriends();

Output

"Bob knows Pete"
"Bob knows Joe"
"Bob knows Larry"
=> undefined

The reason you are seeing an undefined return value is because printFriends doesn't have a return statement.

answered May 4, 2016 at 0:02

Mulan

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1 Comment

Deke Over a year ago

Ref: stackoverflow.com/questions/7187114/…

Andy Hoffman · Accepted Answer · 2016-05-03 23:59:09Z

0

It's working for me. Please see this fiddle and check the console. It's possible that you don't have the transpiler properly configured.

https://jsfiddle.net/e7rb9e4o/

bob.printFriends();

Output:

Bob knows Pete
Bob knows Joe
Bob knows Larry

answered May 3, 2016 at 23:59

Andy Hoffman

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