javascript - Single-Line to Multi-Line ES6 Fat Arrow Function?

Question

I'm learning ES6 fat arrow functions. What is the correct way to change this code, so as to be able to put another line, even const a = 100; in the place indicated so that I can add some more lines to this function?

IMAdded: (options, args) => ({
    IMAdded: {
        filter: newIM => true, *need to add another line here*
    },
}),

Update:

Here's ES6 code that runs:

const subscriptionManager = new SubscriptionManager({
    schema,
    pubsub,
    setupFunctions: {
        APPTAdded: (options, args) => ({
            APPTAdded: {
                filter: appointment => (true),
            },
        }),
});

I'd like to add some more lines into the code that returns true.

Answer 1

If you want to convert the following method into having more lines:

{
  filter: appointment => true
}

You have to add curly braces and a return statement:

{
  filter: appointment => {
    // ... add your other lines here
    return true;
  }
}