How to Use Flutter If Not boolean Value in 2023

The most common conditional statement is used flutter if not boolean value. This is very commonly used in different logical functions. In this article, we will discuss logical operators and flutter if not boolean value. bool is the type of Dart that represents a boolean value that can be true or false.

Flutter If Not boolean Value

The logical operator is the same in all languages. In dart, there is no difference. The logical operator also uses to combine or invert the boolean expressions.

&&Logical AND
||Logical OR
!exprinvert boolean

Example 1:

bool isDownloading = true;
bool isConnection = false;

assert(!isDownloading ); // true
assert(isConnection || isDownloading ); // true because at least one is true
assert(isDownloading && !isConnection); // true because both are true

Example 2:

Let’s consider, we will download a new mp3 from the URL. The important books is isDownloadReady. When it was true, then app start downloading, if not then it will not download the mp3. There have a gallery so I use a bool ifStorageFull, so if it is true then will appear a message that the storage is full, delete some mp3. Let’s consider that the gallery exists 50 mp3.

bool ifStorageFull;
int mp3;
Widget build(BuildContext context) {
  if (mp3> 100) {
    ifStorageFull= true;
  } else {isStorageFull = false;}
return Container(
  child: ifStorageFull? Text("Delete some images") : Text("You can  add more pictures")

So the schema is:

if (fullfilled condition) {
   yourBool = true;
} else {yourBool} = false;

Example 3:

// first assign

bool isFileExist = true;
bool isInternetConnection = true;

// we can combine boolean with  &&, ||, and other symbols
// if isFileExist is true AND isInternetConnection is true
bool isDownloadAnotherFile = isFileExist && isInternetConnection;

if (isDownloadAnotherFile ) {
  print("Downloading next file!");
} else {
  print("Downloading current File!");

At last of Flutter If Not boolean Value

  • Declare the bool with the name isAnyThing or isSomething. example: isDownloading, isFileExist.
  • Variable true or false check.
  • Execute the code after resulting in the true or false.

Read More:

Top 3 Best Ways to Use Flutter Conditional Show Widget

Related articles

Top 5 Business Listing App Template

The Top 5 Business App Template is made for...

Things To Remember For A Flutter Developer Resume | Mind-blowing

This article will enlighten you about how to write...

How to Change the Text Color in Flutter | Change Color of Text in 2023

In this article, we will explore how to change...

Top 5 Best Listing Mobile Directory Apps & Templates in 2023

What are the best Listing Mobile Directory Apps &...

How to Use Path Provide Flutter with Read Write Example in 2023

Path Provider Flutter is a Flutter package for finding...

Case Studies

eDental App

Case Study: eDental Dentist App

Our team recently embarked on an exciting project to develop the eDental Dentist App, a cutting-edge mobile application designed for both Android and iOS...

Voltage Lab SAAS App

Voltage Lab wanted to launch a new SAAS app that would allow students to enjoy educational material with freemium features. We developed a custom...
google play app store listing

Keyword Research for EEE & Cricket Live Score App

A Cricket Live Score App & EEE Engineer App aimed to enhance their visibility on Google and the iOS app store, seeking to rank...