Google Flutter Basics 1

Question 1

Flutter's initial alpha version was released in _____.

Accepted Answer

May 2017

Answer

Flutter's initial alpha version was publicly released in May 2017 at the Google I/O conference. This marked the beginning of its journey as a prominent cross-platform UI toolkit, eventually leading to its stable 1.0 release in December 2018.

Question 2

Dart is _____.

Accepted Answer

Both are correct

Answer

Dart is both a programming language primarily used to construct front-end user interfaces, especially with Flutter, and an object-oriented language. Its object-oriented nature means it supports concepts like classes, objects, inheritance, and polymorphism, which are fundamental to its structure and usage in application development.

Question 3

We can't write a Flutter application without the main() function.

Accepted Answer

True

Answer

This statement is true. Like many programming languages, Dart (and thus Flutter) requires a `main()` function as the entry point for the application. Execution begins from this function, which typically calls `runApp()` to initialize and start the Flutter UI framework.

Question 4

A _____ is an asynchronous sequence of events.

Accepted Answer

Stream

Answer

In Dart and Flutter, a `Stream` represents a sequence of asynchronous events. It's a powerful mechanism for handling data that arrives over time, such as user input, network responses, or file reads, allowing you to listen and react to each event as it occurs.

Question 5

The _____ operator evaluates and returns the value of two expressions.

Accepted Answer

??

Answer

The `??` operator in Dart is the null-aware coalescing operator. It evaluates the expression on its left-hand side; if that expression is non-null, its value is returned. Otherwise, it evaluates and returns the value of the expression on its right-hand side, providing a concise way to provide a default value for potentially null expressions.

Google Flutter Practice Test

Google Flutter Practice Test

Google Flutter Basics 1