Dart has some similarities with Java. See the Intro to Dart for Java Developers codelab for examples of some of the differences between Dart and Java.
Dart has some similarities with Java. See the Intro to Dart for Java Developers codelab for examples of some of the differences between Dart and Java.
Yes, Dart 2 is statically typed. For more information, read about Dart’s type system.
With its combination of static and runtime checks, Dart has a sound type system, which guarantees that an expression of one type cannot produce a value of another type. No surprises!
Even with type-safe Dart, you can annotate any variable with dynamic if you need the flexibility of a dynamic language. The dynamic type itself is static, but can contain any type at runtime. Of course, that removes many of the benefits of a type-safe language for that variable.
You can find many packages on the pub.dev site a service for hosting packages of Dart code. Use the pub
command to package your code and upload to the site.
Yes! You can build an Android app that also works on iOS from a single codebase using Flutter, which is powered by the Dart platform.
Google Ads, AdSense, AdMob, and the Google Assistant all use Dart. A significant portion of Google’s revenue flows through these apps. Inside or outside of Google, every Flutter app uses Dart.
Yes. For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.
Flutter is a sample framework that uses Dart’s native compilation capability to produce fast native apps.
The following code uses many of Dart’s most basic features:
// Define a function.
void printInteger(int aNumber) {
print(‘The number is $aNumber.’); // Print to console.
}
// This is where the app starts executing.
void main() {
var number = 42; // Declare and initialize a variable.
printInteger(number); // Call a function.
}
Here’s what this program uses that applies to all (or almost all) Dart apps:
// This is a comment.
void
printInteger()
and main()
that don’t explicitly return a value have the void
return type.int
String
, List
, and bool
.42
print()
'...'
(or "..."
)$variableName
(or ${expression}
)main()
var
int
) is determined by its initial value (42
).