FAQ: Objects - Property Assignment


This community-built FAQ covers the “Property Assignment” exercise from the lesson “Objects”.

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This exercise can be found in the following Codecademy content:

Web Development

Introduction To JavaScript

FAQs on the exercise Property Assignment

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When deleting a property that has 2 words, e.g. ‘Secret Mission’, from an object, how can you use the dot operator? For example:

delete spaceship.‘Secret Mission’; // this returns an error for me

I can only use the bracket notation in this case?
delete spaceship[‘Secret Mission’]; // this works fine


That’s not a valid identifier so, no, you can’t use dot notation for that


We can create object with two ways :

spaceship.numEngines = 3;
spaceship[“numEngines2”] = 4;

When i tried create .invert() object with two ways :

invert (object) {
let invertedObject = {};
for (let key in object) {
invertedObject[object[key]] = key
return invertedObject;
This works fine but :

invert (object) {
let invertedObject = {};
for (let key in object) {
invertedObject.object[key] = key
return invertedObject;

This doesn’t work , Why ?:roll_eyes: