So as you can see I have a greeting function and similar to that the getsMarried function. However, getsMarried is shown as a prototype (colored green in VSCode, opposed to yellow). Is this because I use this.lastName? Because the tutorial I am learning from is also doing the same without it shown as a prototype.

const personPrototypes = {
  greeting: function(){
    `$Hello there ${this.firstName} ${this.lastName}`
  },
  getsMarried: function(newLastName){
    this.lastName = newLastName
  }
}

const mary = Object.create(personPrototypes)
mary.firstName = 'Mary'
mary.lastName = 'Williams'
mary.age = 30

mary.getsMarried('Wlii')

console.log(mary.greeting())

CodePudding user response：

console.log does not show result as there is nothing to show. So we can return your greeting from the function to be shown in console.log.

As mdn says:

The return statement ends function execution and specifies a value to be returned to the function caller.

An example:

const personPrototypes = {
  greeting: function(){
    return `$Hello there ${this.firstName} ${this.lastName}`
  },
  getsMarried: function(newLastName){
    this.lastName = newLastName
  }
}

const mary = Object.create(personPrototypes)
mary.firstName = 'Mary'
mary.lastName = 'Williams'
mary.age = 30

mary.getsMarried('Wlii')

console.log(mary.greeting())