The Modern JavaScript Bootcamp (2019) - The Object Spread Syntax

This video tutorial introduces the spread operator for objects in JavaScript, explaining how to configure Babel to support this syntax. It demonstrates using the spread operator to copy and merge object properties, highlighting the importance of order when overriding properties. The tutorial concludes with a challenge to create and merge objects using the spread operator.

What is the primary purpose of the spread operator when used with objects?

• To merge two arrays

• To copy properties from one object to another

• To delete properties from an object

• To create a new object with default values

Which Babel plugin is required to enable the object spread operator?

• babel-plugin-transform-object-rest-spread

• babel-plugin-transform-react-jsx

• babel-plugin-transform-async-to-generator

• babel-plugin-transform-es2015-arrow-functions

What is the result of using the spread operator on an object?

• It creates a reference to the original object

• It creates a shallow copy of the object

• It merges the object with another object

• It creates a deep copy of the object

How can you add new properties to an object while using the spread operator?

• By using the 'new' keyword

• By adding properties after the spread operator

• By using the 'delete' keyword

• By using the 'Object.assign' method

What happens if you define a property before spreading an object that has the same property?

• The defined property value is retained

• The spread object property value overrides the defined property

• An error is thrown

• Both property values are merged

In the challenge, what are the properties of the 'person' object?

• job and salary

• city and country

• height and weight

• name and age

What is the final object created in the challenge called?

• summary

• overview

• details

• profile