How to add two properties from the same object in an object in javascript [duplicate]

Question

let aboutMark = {
  firstName: "Mark",
  lastName: "Miller",
  height: 1.69,
  weight: 78,
  bmiCalculator: function(){
    this.markBMI = (this.weight / (this.height * this.height)) 
    return  this.markBMI
  }
};
aboutMark.bmiCalculator()
console.log(aboutMark);

What i want to do here is inside aboutMark object i want to add an property and i want the values to be equal to firstName + lastName. How do we do it.

btw, why a property which reflects the first name? why not take an independent propery, like bmi? — Nina Scholz
– Nina Scholz, Commented Oct 16, 2022 at 11:27

SamHoque · Accepted Answer · 2022-10-16 11:35:54Z

0

You could create a value after the object was made.

aboutMark['fullName'] = aboutMark.firstName + " " + aboutMark.lastName;

Or make a dynamic function and call it using console.log(aboutMark.fullName())

let aboutMark = {
    firstName: "Mark",
    lastName: "Miller",
    height: 1.69,
    weight: 78,
    bmiCalculator: function(){
        this.markBMI = (this.weight / (this.height * this.height))
        return  this.markBMI
    },
    fullName: function(){
        return this.firstName + " " + this.lastName
    }
};

You can also use a getter, Thanks @Nick Parsons

let aboutMark = {
    firstName: "Mark",
    lastName: "Miller",
    height: 1.69,
    weight: 78,
    bmiCalculator: function(){
        this.markBMI = (this.weight / (this.height * this.height))
        return  this.markBMI
    },
    get fullName(){
        return this.firstName + " " + this.lastName
    }
};

edited Oct 16, 2022 at 11:35

answered Oct 16, 2022 at 11:24

SamHoque

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4 Comments

Nick Parsons Over a year ago

The second option won't work because this inside of the IIFE will be the global object (window in nonstrict browser code). You're better off using a getter.

SamHoque Over a year ago

Tested it in Node.js seems to be returning the correct output @NickParsons

flyingfox Over a year ago

@SamHoque I tested in stackoverflow code snippet,and it won't work

Nick Parsons Over a year ago

Also tested it in nodejs, the second option doesn't work there either, unless you populate the global scope with firstName and lastName variables.

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