Method vs member holding a function

class.ts

class Foobar {
  private name = 'foobar'

  getName = () => {
    return this.name
  }
}

class Barfoo {
  private name = 'barfoor'

  getName() {
    return this.name
  }
}

console.log(new Foobar())
// Foobar { name: 'foobar', getName: [Function (anonymous)] }

console.log(new Barfoo())
// Barfoo { name: 'barfoo' }

console.log(Object.keys(new Foobar()))
// [ 'name', 'getName' ]

console.log(Object.keys(new Barfoo()))
// [ 'name' ]