European Darts Tour 2020
Die European Tour umfasst dreizehn Events, die in Deutschland, Österreich, Niederlanden, Belgien, Ungarn, Tschechien und Gibraltar ausgetragen werden. Live Leaderboard und alle News der European Tour & PGA Tour. Originalkarten jetzt zu Top-Preisen bestellen und Darts Open Frankfurt live erleben. Einfach & % sicher beim Marktführer!Dart Tour Deutschland Hauptnavigation Video
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Variables store references. The type of the name variable is inferred to be String , but you can change that type by specifying it.
Uninitialized variables have an initial value of null. Even variables with numeric types are initially null, because numbers—like everything else in Dart—are objects.
If you never intend to change a variable, use final or const , either instead of var or in addition to a type. A final variable can be set only once; a const variable is a compile-time constant.
Const variables are implicitly final. Use const for variables that you want to be compile-time constants.
If the const variable is at the class level, mark it static const. Where you declare the variable, set the value to a compile-time constant such as a number or string literal, a const variable, or the result of an arithmetic operation on constant numbers:.
You can also use it to create constant values , as well as to declare constructors that create constant values. Any variable can have a constant value.
You can omit const from the initializing expression of a const declaration, like for baz above. You can change the value of a non-final, non-const variable, even if it used to have a const value:.
As of Dart 2. For more information on using const to create constant values, see Lists , Maps , and Classes. You can initialize an object of any of these special types using a literal.
For example, 'this is a string' is a string literal, and true is a boolean literal. Because every variable in Dart refers to an object—an instance of a class —you can usually use constructors to initialize variables.
Some of the built-in types have their own constructors. For example, you can use the Map constructor to create a map. Integer values no larger than 64 bits, depending on the platform.
On the Dart VM, values can be from -2 63 to 2 63 - 1. Both int and double are subtypes of num. Integers are numbers without a decimal point.
Here are some examples of defining integer literals:. If a number includes a decimal, it is a double. Here are some examples of defining double literals:.
For example:. Literal numbers are compile-time constants. Many arithmetic expressions are also compile-time constants, as long as their operands are compile-time constants that evaluate to numbers.
A Dart string is a sequence of UTF code units. You can use either single or double quotes to create a string:.
Another way to create a multi-line string: use a triple quote with either single or double quotation marks:. See Runes and grapheme clusters for details on how to express Unicode characters in a string.
Literal strings are compile-time constants, as long as any interpolated expression is a compile-time constant that evaluates to null or a numeric, string, or boolean value.
For more information on using strings, see Strings and regular expressions. To represent boolean values, Dart has a type named bool.
Only two objects have type bool: the boolean literals true and false , which are both compile-time constants. Instead, explicitly check for values, like this:.
Perhaps the most common collection in nearly every programming language is the array , or ordered group of objects. In Dart, arrays are List objects, so most people just call them lists.
You can add a comma after the last item in a Dart collection literal. Lists use zero-based indexing, where 0 is the index of the first value and list.
Dart 2. For example, you can use the spread operator If the expression to the right of the spread operator might be null, you can avoid exceptions by using a null-aware spread operator?
For more details and examples of using the spread operator, see the spread operator proposal. For more details and examples of using collection if and for, see the control flow collections proposal.
The List type has many handy methods for manipulating lists. For more information about lists, see Generics and Collections. A set in Dart is an unordered collection of unique items.
Dart support for sets is provided by set literals and the Set type. Add items to an existing set using the add or addAll methods:. For more information, see the list spread operator and list collection operator discussions.
For more information about sets, see Generics and Sets. In general, a map is an object that associates keys and values.
Both keys and values can be any type of object. Each key occurs only once, but you can use the same value multiple times. Dart support for maps is provided by map literals and the Map type.
For details and examples, see the spread operator proposal and the control flow collections proposal. For more information about maps, see Generics and Maps.
In Dart, runes expose the Unicode code points of a string. Because a Dart string is a sequence of UTF code units, expressing Unicode code points within a string requires special syntax.
To specify more or less than 4 hex digits, place the value in curly brackets. If you need to read or write individual Unicode characters, use the characters getter defined on String by the characters package.
The returned Characters object is the string as a sequence of grapheme clusters. For details on using the characters package to manipulate strings, see the example and API reference for the characters package.
A Symbol object represents an operator or identifier declared in a Dart program. To get the symbol for an identifier, use a symbol literal, which is just followed by the identifier:.
Dart is a true object-oriented language, so even functions are objects and have a type, Function. This means that functions can be assigned to variables or passed as arguments to other functions.
You can also call an instance of a Dart class as if it were a function. For details, see Callable classes. Although Effective Dart recommends type annotations for public APIs , the function still works if you omit the types:.
A function can have any number of required positional parameters. Dart-Fans aufgepasst! Lesen Sie auch. Auch Interessant. Um mit Inhalten aus Twitter und anderen sozialen Netzwerken zu interagieren oder diese darzustellen, brauchen wir deine Zustimmung.
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