I was not aware of the two syntax styles here. Are there valid uses/reasons for both?

es5.js

// one
[].each(function (foo) {
  return foo.info ? "hello" : "hi";
});

// two
[].each(function (foo) {
  return foo.info ? "hello" : "hi";
});

// three
[].each(function (foo) {
  foo.info ? "hello" : "hi";
});

es6.js

// one
[].each(foo => foo.info ? 'hello' : 'hi');

// two
[].each((foo) => { return foo.info ? 'hello' : 'hi'; });

// three
[].each((foo) => { foo.info ? 'hello' : 'hi'; });