JS Object Review Quiz

What is a JavaScript object?

• A collection of data types

• A composite data type with multiple attributes

• An array with various elements

• A homogenous object with multiple attirbutes

Which notation is used to access properties of an object?

• Dot Notation

• Bracket Notation

• Both Dot and Bracket Notation

• Parenthese Notation

How do you create an empty object?

• let obj = { };

• let obj = [ ];

• let obj = { }

• let obj = ();

Which method can add a property to an object

• obj.addProperty

• obj.property = value

• obj[property] = value

• obj[property]

How can you remove a property from an object in JavaScript?

• remove obj.property;

• delete obj.property;

• obj.property.remove();

• delete obj[property];

What will be the output of the following code:

What is the correct way to create a nested object in JavaScript?

• let obj = {key: {nestedKey: value}};

• let obj = {key: [nestedKey: value]};

• let obj = [key: {nestedKey: value}];

• let obj = {key: (nestedKey: value)};

How do you loop through all the properties of an object?

• for...of loop

• for...in loop

• forEach loop

• while loop

What will be the result of console.log(obj['key']); if the key does not exist in the object?

• null

• undefined

• false

• Error