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Show us a basic Dart program?
#

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.
A single-line comment. Dart also supports multi-line and document comments. For details, see Comments.
void
A special type that indicates a value that’s never used. Functions like printInteger() and main() that don’t explicitly return a value have the void return type.
int
Another type, indicating an integer. Some additional built-in types are String, List, and bool.
42
A number literal. Number literals are a kind of compile-time constant.
print()
A handy way to display output.
'...' (or "...")
A string literal.
$variableName (or ${expression})
String interpolation: including a variable or expression’s string equivalent inside of a string literal. For more information, see Strings.
main()
The special, required, top-level function where app execution starts. For more information, see The main() function.
var
A way to declare a variable without specifying its type. The type of this variable (int) is determined by its initial value (42).
Can I compile Dart code to native code?
#

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.

What are some real-world production deployments of Dart?
#

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.

Can I build an Android app with Dart?
#

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.

How do I use third party code, or share code?
#

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.

Is Dart a statically typed language?
#

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.

Isn’t Dart a lot like 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.

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