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DART FIX | DART
dart fix. The dart fix command (added in Dart 2.12) finds and fixes two types of issues: For more information about this and other dart commands, see the Dart command-line tool page. To preview proposed changes, use the --dry-run flag: For information about how automated package API changes work, see dart.dev/go/dart-fix. URI CLASS - DART:CORE LIBRARY - DART API read-only. queryParameters → Map < String, String >. Returns the URI query split into a map according to the rules specified for FORM post in the HTML 4.01 specification section 17.13.4 . Each key and value in the returned map has been decoded. If there is no query the empty mapis returned.
TIMER CLASS
Timer. class. A count-down timer that can be configured to fire once or repeatedly. The timer counts down from the specified duration to 0. When the timer reaches 0, the timer invokes the specified callback function. Use a periodic timer to repeatedly count down the same interval. A negative duration is treated the same as a duration of 0.STDIN CLASS
Stdin class Null safety. Stdin. class. The standard input stream of the process. Allows both synchronous and asynchronous reads from the standard input stream. Mixing synchronous and asynchronous reads is undefined. Inheritance. DART PROGRAMMING LANGUAGE A programming language that is easy to learn, with a familiar syntax. Productive Development. Make changes to your source code iteratively, using hot reload to instantly see the effect in the running app. Write code using a flexible type system with rich static analysis and powerful, configurable tooling.DART FIX | DART
dart fix. The dart fix command (added in Dart 2.12) finds and fixes two types of issues: For more information about this and other dart commands, see the Dart command-line tool page. To preview proposed changes, use the --dry-run flag: For information about how automated package API changes work, see dart.dev/go/dart-fix. URI CLASS - DART:CORE LIBRARY - DART API read-only. queryParameters → Map < String, String >. Returns the URI query split into a map according to the rules specified for FORM post in the HTML 4.01 specification section 17.13.4 . Each key and value in the returned map has been decoded. If there is no query the empty mapis returned.
TIMER CLASS
Timer. class. A count-down timer that can be configured to fire once or repeatedly. The timer counts down from the specified duration to 0. When the timer reaches 0, the timer invokes the specified callback function. Use a periodic timer to repeatedly count down the same interval. A negative duration is treated the same as a duration of 0.STDIN CLASS
Stdin class Null safety. Stdin. class. The standard input stream of the process. Allows both synchronous and asynchronous reads from the standard input stream. Mixing synchronous and asynchronous reads is undefined. Inheritance.DART COMPILE
Use the dart compile command to compile a Dart program to a target platform.The output — which you specify using a subcommand — can either include a Dart runtime or be a snapshot.. For more information about this and other dart commands, see the Dart command-line tool page.. Here’s an example of using the exe subcommand to produce a self-contained executable file (myapp.exe):VISUAL STUDIO CODE
Visual Studio Code. With the Dart plugin, you can use Visual Studio Code (VS Code) to develop Dart apps. The Flutter site has details on how to set up and use VS Code for Flutter apps. Until this page has more information, see the Flutter documentation for instructions that you can apply to other kinds of Dart apps: LIST CLASS - DART:CORE LIBRARY - DART API API docs for the List class from the dart:core library, for the Dart programming language. DART:MIRRORS LIBRARY LibraryDependencyMirror. A mirror on an import or export declaration. LibraryMirror. A LibraryMirror reflects a Dart language library, providing access to the variables, functions, and classes of the library. MethodMirror. A MethodMirror reflects a Dart languagefunction,
STRING CLASS
class. A sequence of UTF-16 code units. Strings are mainly used to represent text. A character may be represented by multiple code points, each code point consisting of one or two code units. For example the Papua New Guinea flag character requires four code units to represent two code points, but should be treated like a singlecharacter
POINTER CLASS
Access to the raw pointer value. On 32-bit systems, the upper 32-bits of the result are 0. read-only. hashCode → int. The hash code for a Pointer only depends on its address. read-only, override. runtimeType → Type. A representation of the runtime type of the object. read-only, inherited. MAP CLASS - DART:CORE LIBRARY - DART API K. , V. >. class. A collection of key/value pairs, from which you retrieve a value using its associated key. There is a finite number of keys in the map, and each key has exactly one value associated with it. Maps, and their keys and values, can be iterated. The order of iteration is defined by the individual type of map.FUTURE CLASS
API docs for the Future class from the dart:async library, for the Dart programming language.VALUES PROPERTY
values. property. The values of this. The values are iterated in the order of their corresponding keys. This means that iterating keys and values in parallel will provide matching pairs of keys and values. The returned iterable has an efficient length method based on the length of the map. Its Iterable.contains method is based on == comparison.READLINESYNC METHOD
readLineSync method Null safety. readLineSync. method. Reads a line from stdin. Blocks until a full line is available. Lines my be terminated by either or . On Windows, in cases where the stdioType of stdin is StdioType.terminal , the terminator may also be a single . Input bytes are converted to a string by encoding . DART PROGRAMMING LANGUAGE A programming language that is easy to learn, with a familiar syntax. Productive Development. Make changes to your source code iteratively, using hot reload to instantly see the effect in the running app. Write code using a flexible type system with rich static analysis and powerful, configurable tooling.DART FIX | DART
dart fix. The dart fix command (added in Dart 2.12) finds and fixes two types of issues: For more information about this and other dart commands, see the Dart command-line tool page. To preview proposed changes, use the --dry-run flag: For information about how automated package API changes work, see dart.dev/go/dart-fix. MIGRATING TO NULL SAFETY This page describes how and when to migrate your code to null safety.Here are the basic steps for migrating each package that you own: Wait for the packages that you depend on to migrate.; Migrate your package’s code, preferably using the interactive migration tool.; Statically analyze your package’s code.; Test to make sure your changes work.; If the package is already on pub.dev, publish URI CLASS - DART:CORE LIBRARY - DART API read-only. queryParameters → Map < String, String >. Returns the URI query split into a map according to the rules specified for FORM post in the HTML 4.01 specification section 17.13.4 . Each key and value in the returned map has been decoded. If there is no query the empty mapis returned.
TIMER CLASS
Timer. class. A count-down timer that can be configured to fire once or repeatedly. The timer counts down from the specified duration to 0. When the timer reaches 0, the timer invokes the specified callback function. Use a periodic timer to repeatedly count down the same interval. A negative duration is treated the same as a duration of 0. DART PROGRAMMING LANGUAGE A programming language that is easy to learn, with a familiar syntax. Productive Development. Make changes to your source code iteratively, using hot reload to instantly see the effect in the running app. Write code using a flexible type system with rich static analysis and powerful, configurable tooling.DART FIX | DART
dart fix. The dart fix command (added in Dart 2.12) finds and fixes two types of issues: For more information about this and other dart commands, see the Dart command-line tool page. To preview proposed changes, use the --dry-run flag: For information about how automated package API changes work, see dart.dev/go/dart-fix. MIGRATING TO NULL SAFETY This page describes how and when to migrate your code to null safety.Here are the basic steps for migrating each package that you own: Wait for the packages that you depend on to migrate.; Migrate your package’s code, preferably using the interactive migration tool.; Statically analyze your package’s code.; Test to make sure your changes work.; If the package is already on pub.dev, publish URI CLASS - DART:CORE LIBRARY - DART API read-only. queryParameters → Map < String, String >. Returns the URI query split into a map according to the rules specified for FORM post in the HTML 4.01 specification section 17.13.4 . Each key and value in the returned map has been decoded. If there is no query the empty mapis returned.
TIMER CLASS
Timer. class. A count-down timer that can be configured to fire once or repeatedly. The timer counts down from the specified duration to 0. When the timer reaches 0, the timer invokes the specified callback function. Use a periodic timer to repeatedly count down the same interval. A negative duration is treated the same as a duration of 0.DART DEVTOOLS
Dart DevTools is a suite of debugging and performance tools for Dart and Flutter. These tools are distributed in IDEs, the flutter tool, the webdev tool, and the devtools package.. The following table shows which tools you can use with common Dart app types.DART COMPILE
Use the dart compile command to compile a Dart program to a target platform.The output — which you specify using a subcommand — can either include a Dart runtime or be a snapshot.. For more information about this and other dart commands, see the Dart command-line tool page.. Here’s an example of using the exe subcommand to produce a self-contained executable file (myapp.exe): UNDERSTANDING NULL SAFETY Written by Bob Nystrom July 2020. Null safety is the largest change we’ve made to Dart since we replaced the original unsound optional type system with a sound static type system in Dart 2.0. When Dart first launched, compile-time null safety was a rare feature needing along introduction.
DART PUB UPGRADE
Upgrade is one of the commands of the pub tool. $ dart pub upgrade Like dart pub get, dart pub upgrade gets dependencies. The difference is that dart pub upgrade ignores any existing lockfile, so that pub can get the latest versions of all dependencies.A related command is dart pub outdated, which you can run to find out-of-date dependencies. DART:MIRRORS LIBRARY LibraryDependencyMirror. A mirror on an import or export declaration. LibraryMirror. A LibraryMirror reflects a Dart language library, providing access to the variables, functions, and classes of the library. MethodMirror. A MethodMirror reflects a Dart languagefunction,
STRING CLASS
class. A sequence of UTF-16 code units. Strings are mainly used to represent text. A character may be represented by multiple code points, each code point consisting of one or two code units. For example the Papua New Guinea flag character requires four code units to represent two code points, but should be treated like a singlecharacter
POINTER CLASS
Access to the raw pointer value. On 32-bit systems, the upper 32-bits of the result are 0. read-only. hashCode → int. The hash code for a Pointer only depends on its address. read-only, override. runtimeType → Type. A representation of the runtime type of the object. read-only, inherited.REDUCE METHOD
methodreduce. reduce. E reduce (. E combine(E value, E element) ) Reduces a collection to a single value by iteratively combining elements of the collection using the provided function. The iterable must have at least one element. If it has only one element, that element is returned. Otherwise this method starts with the firstelement from the
READLINESYNC METHOD
readLineSync method Null safety. readLineSync. method. Reads a line from stdin. Blocks until a full line is available. Lines my be terminated by either or . On Windows, in cases where the stdioType of stdin is StdioType.terminal , the terminator may also be a single . Input bytes are converted to a string by encoding .OPERATOR + METHOD
Adds other to this number.. The result is an int, as described by int.+, if both this number and other is an integer, otherwise the result is a double.. Implementation double operator +(num other);GET THE DART SDK
Then install the Dart SDK: $ sudo apt-get update $ sudo apt-get install dart. Install a Debian package. Alternatively, download Dart SDK as a Debian package in the .deb package format. Modify PATH for access to all Dart binaries. After installing the SDK, add its bin directory to your PATH.DART:MATH LIBRARY
Mathematical constants and functions, plus a random number generator. To use this library in your code: import 'dart:math'; Classes MutableRectangle < T extends num > A class for representing two-dimensional axis-aligned rectangles with mutable properties. C INTEROP USING DART:FFI The hello.dart file illustrates the steps for using dart:ffi to call a C function: Import dart:ffi. Import the path library that you’ll use to store the path of dynamic library. Create a typedef with the FFI type signature of the C function. Create a typedef for the variable that you’ll use when calling the C function. DART:MIRRORS LIBRARY LibraryDependencyMirror. A mirror on an import or export declaration. LibraryMirror. A LibraryMirror reflects a Dart language library, providing access to the variables, functions, and classes of the library. MethodMirror. A MethodMirror reflects a Dart languagefunction,
TIMER CLASS
Timer. class. A count-down timer that can be configured to fire once or repeatedly. The timer counts down from the specified duration to 0. When the timer reaches 0, the timer invokes the specified callback function. Use a periodic timer to repeatedly count down the same interval. A negative duration is treated the same as a duration of 0.REGEXP CLASS
All other methods in RegExp can be build from that. Use allMatches to look for all matches of a regular expression in a string. The following example finds all matches of a regular expression in a string. RegExp exp = RegExp ( r" (\w+)" ); String str = "Parse my string" ; Iterable matches = exp.allMatches (str); Note the use of aREDUCE METHOD
methodreduce. reduce. E reduce (. E combine(E value, E element) ) Reduces a collection to a single value by iteratively combining elements of the collection using the provided function. The iterable must have at least one element. If it has only one element, that element is returned. Otherwise this method starts with the firstelement from the
STRUCT CLASS
Struct. class. The supertype of all FFI struct types. FFI struct types should extend this class and declare fields corresponding to the underlying native structure. Field declarations in a Struct subclass declaration are automatically given a setter and getter implementationwhich accesses the
INT32LIST CLASS
Checks that this iterable has only one element, and returns that element. Constructors Int32List (int length). Creates an Int32List of the specified length (in elements), all of whose elements are initially zero.. Int32List.fromList (List elements). Creates a Int32List with the same length as the elements list and copies over the elements.. Int32List.view (ByteBuffer buffer, [intENCODEFULL METHOD
encodeFull. method. Encodes the string uri using percent-encoding to make it safe for literal use as a full URI. All characters except uppercase and lowercase letters, digits and the characters !#$&' ()*+,-./:;=?@_~ are percent-encoded. This is the set of charactersspecified in
GET THE DART SDK
Then install the Dart SDK: $ sudo apt-get update $ sudo apt-get install dart. Install a Debian package. Alternatively, download Dart SDK as a Debian package in the .deb package format. Modify PATH for access to all Dart binaries. After installing the SDK, add its bin directory to your PATH.DART:MATH LIBRARY
Mathematical constants and functions, plus a random number generator. To use this library in your code: import 'dart:math'; Classes MutableRectangle < T extends num > A class for representing two-dimensional axis-aligned rectangles with mutable properties. C INTEROP USING DART:FFI The hello.dart file illustrates the steps for using dart:ffi to call a C function: Import dart:ffi. Import the path library that you’ll use to store the path of dynamic library. Create a typedef with the FFI type signature of the C function. Create a typedef for the variable that you’ll use when calling the C function. DART:MIRRORS LIBRARY LibraryDependencyMirror. A mirror on an import or export declaration. LibraryMirror. A LibraryMirror reflects a Dart language library, providing access to the variables, functions, and classes of the library. MethodMirror. A MethodMirror reflects a Dart languagefunction,
TIMER CLASS
Timer. class. A count-down timer that can be configured to fire once or repeatedly. The timer counts down from the specified duration to 0. When the timer reaches 0, the timer invokes the specified callback function. Use a periodic timer to repeatedly count down the same interval. A negative duration is treated the same as a duration of 0.REGEXP CLASS
All other methods in RegExp can be build from that. Use allMatches to look for all matches of a regular expression in a string. The following example finds all matches of a regular expression in a string. RegExp exp = RegExp ( r" (\w+)" ); String str = "Parse my string" ; Iterable matches = exp.allMatches (str); Note the use of aREDUCE METHOD
methodreduce. reduce. E reduce (. E combine(E value, E element) ) Reduces a collection to a single value by iteratively combining elements of the collection using the provided function. The iterable must have at least one element. If it has only one element, that element is returned. Otherwise this method starts with the firstelement from the
STRUCT CLASS
Struct. class. The supertype of all FFI struct types. FFI struct types should extend this class and declare fields corresponding to the underlying native structure. Field declarations in a Struct subclass declaration are automatically given a setter and getter implementationwhich accesses the
INT32LIST CLASS
Checks that this iterable has only one element, and returns that element. Constructors Int32List (int length). Creates an Int32List of the specified length (in elements), all of whose elements are initially zero.. Int32List.fromList (List elements). Creates a Int32List with the same length as the elements list and copies over the elements.. Int32List.view (ByteBuffer buffer, [intENCODEFULL METHOD
encodeFull. method. Encodes the string uri using percent-encoding to make it safe for literal use as a full URI. All characters except uppercase and lowercase letters, digits and the characters !#$&' ()*+,-./:;=?@_~ are percent-encoded. This is the set of charactersspecified in
DARTDOC | DART
The dartdoc command creates API reference documentation from Dart source code. You can add descriptions to the generated documentation by using documentation comments, which can contain markdown formatting.For guidance on writing doc comments, see the documentation part of Effective Dart.. Run dartdoc from the root directory of your package. For example: C INTEROP USING DART:FFI Dart mobile, command-line, and server apps running on the Dart Native platform can use the dart:ffi library to call native C APIs. FFI stands for foreign function interface. Other terms for similar functionality include native interface and language bindings.. API documentation is available in the dart:ffi API reference. ExamplesDART:IO LIBRARY
Only the following can import and use the dart:io library: This library allows you to work with files, directories, sockets, processes, HTTP servers and clients, and more. Many operations related to input and output are asynchronous and are handled using Future s or Stream s, both of which are defined in the dart:async library.DART FIX | DART
dart fix. The dart fix command (added in Dart 2.12) finds and fixes two types of issues: For more information about this and other dart commands, see the Dart command-line tool page. To preview proposed changes, use the --dry-run flag: For information about how automated package API changes work, see dart.dev/go/dart-fix.POW FUNCTION
pow. function. num pow (. num x, num exponent. ) Returns x to the power of exponent. If x is an int and exponent is a non-negative int, the result is an int, otherwise both arguments are converted to doubles first, and the result is a double. For integers, the power is always equal to the mathematical result of x to the power exponent,only
REGEXP CLASS
All other methods in RegExp can be build from that. Use allMatches to look for all matches of a regular expression in a string. The following example finds all matches of a regular expression in a string. RegExp exp = RegExp ( r" (\w+)" ); String str = "Parse my string" ; Iterable matches = exp.allMatches (str); Note the use of aPOINTER CLASS
Access to the raw pointer value. On 32-bit systems, the upper 32-bits of the result are 0. read-only. hashCode → int. The hash code for a Pointer only depends on its address. read-only, override. runtimeType → Type. A representation of the runtime type of the object. read-only, inherited.INT32LIST CLASS
Checks that this iterable has only one element, and returns that element. Constructors Int32List (int length). Creates an Int32List of the specified length (in elements), all of whose elements are initially zero.. Int32List.fromList (List elements). Creates a Int32List with the same length as the elements list and copies over the elements.. Int32List.view (ByteBuffer buffer, [intDATETIME CLASS
DateTime. class. An instant in time, such as July 20, 1969, 8:18pm GMT. DateTimes can represent time values that are at a distance of at most 100,000,000 days from epoch (1970-01-01 UTC): -271821-04-20 to 275760-09-13. Create a DateTime object by using one of the constructors or by parsing a correctly formatted string, whichcomplies with a
REDUCE METHOD
methodreduce. reduce. E reduce (. E combine(E value, E element) ) Reduces a collection to a single value by iteratively combining elements of the collection using the provided function. The iterable must have at least one element. If it has only one element, that element is returned. Otherwise this method starts with the firstelement from the
DART PROGRAMMING LANGUAGE A programming language that is easy to learn, with a familiar syntax. Productive Development. Make changes to your source code iteratively, using hot reload to instantly see the effect in the running app. Write code using a flexible type system with rich static analysis and powerful, configurable tooling.GET THE DART SDK
Then install the Dart SDK: $ sudo apt-get update $ sudo apt-get install dart. Install a Debian package. Alternatively, download Dart SDK as a Debian package in the .deb package format. Modify PATH for access to all Dart binaries. After installing the SDK, add its bin directory to your PATH.WEB | DART
Resources for developing Dart web apps. Dart 2.13 is here, with type aliases and improved FFI support for structs.VISUAL STUDIO CODE
Visual Studio Code. With the Dart plugin, you can use Visual Studio Code (VS Code) to develop Dart apps. The Flutter site has details on how to set up and use VS Code for Flutter apps. Until this page has more information, see the Flutter documentation for instructions that you can apply to other kinds of Dart apps: C INTEROP USING DART:FFI The hello.dart file illustrates the steps for using dart:ffi to call a C function: Import dart:ffi. Import the path library that you’ll use to store the path of dynamic library. Create a typedef with the FFI type signature of the C function. Create a typedef for the variable that you’ll use when calling the C function. EFFECTIVE DART: STYLEDART:MATH LIBRARY
Mathematical constants and functions, plus a random number generator. To use this library in your code: import 'dart:math'; Classes MutableRectangle < T extends num > A class for representing two-dimensional axis-aligned rectangles with mutable properties.INT32LIST CLASS
Checks that this iterable has only one element, and returns that element. Constructors Int32List (int length). Creates an Int32List of the specified length (in elements), all of whose elements are initially zero.. Int32List.fromList (List elements). Creates a Int32List with the same length as the elements list and copies over the elements.. Int32List.view (ByteBuffer buffer, [intINDEXWHERE METHOD
indexWhere. method. The first index in the list that satisfies the provided test. Searches the list from index start to the end of the list. The first time an object o is encountered so that test (o) is true, the index of o is returned. Returns -1 if element is not found.CLOSE METHOD
close. method. Closes the WebSocket connection. Set the optional code and reason arguments to send close information to the remote peer. If they are omitted, the peer will see WebSocketStatus.noStatusReceived code with no reason. DART PROGRAMMING LANGUAGE A programming language that is easy to learn, with a familiar syntax. Productive Development. Make changes to your source code iteratively, using hot reload to instantly see the effect in the running app. Write code using a flexible type system with rich static analysis and powerful, configurable tooling.GET THE DART SDK
Then install the Dart SDK: $ sudo apt-get update $ sudo apt-get install dart. Install a Debian package. Alternatively, download Dart SDK as a Debian package in the .deb package format. Modify PATH for access to all Dart binaries. After installing the SDK, add its bin directory to your PATH.WEB | DART
Resources for developing Dart web apps. Dart 2.13 is here, with type aliases and improved FFI support for structs.VISUAL STUDIO CODE
Visual Studio Code. With the Dart plugin, you can use Visual Studio Code (VS Code) to develop Dart apps. The Flutter site has details on how to set up and use VS Code for Flutter apps. Until this page has more information, see the Flutter documentation for instructions that you can apply to other kinds of Dart apps: C INTEROP USING DART:FFI The hello.dart file illustrates the steps for using dart:ffi to call a C function: Import dart:ffi. Import the path library that you’ll use to store the path of dynamic library. Create a typedef with the FFI type signature of the C function. Create a typedef for the variable that you’ll use when calling the C function. EFFECTIVE DART: STYLEDART:MATH LIBRARY
Mathematical constants and functions, plus a random number generator. To use this library in your code: import 'dart:math'; Classes MutableRectangle < T extends num > A class for representing two-dimensional axis-aligned rectangles with mutable properties.INT32LIST CLASS
Checks that this iterable has only one element, and returns that element. Constructors Int32List (int length). Creates an Int32List of the specified length (in elements), all of whose elements are initially zero.. Int32List.fromList (List elements). Creates a Int32List with the same length as the elements list and copies over the elements.. Int32List.view (ByteBuffer buffer, [intINDEXWHERE METHOD
indexWhere. method. The first index in the list that satisfies the provided test. Searches the list from index start to the end of the list. The first time an object o is encountered so that test (o) is true, the index of o is returned. Returns -1 if element is not found.CLOSE METHOD
close. method. Closes the WebSocket connection. Set the optional code and reason arguments to send close information to the remote peer. If they are omitted, the peer will see WebSocketStatus.noStatusReceived code with no reason.DART DOCUMENTATION
Dart documentation. Welcome to the Dart documentation! For a list of changes to this site — new pages, new guidelines, and more — see the What’s new page. Here are some of this site’s most visitedpages:
EFFECTIVE DART
Over the past several years, we’ve written a ton of Dart code and learned a lot about what works well and what doesn’t. We’re sharing this with you so you can write consistent, robust, fast codetoo.
EFFECTIVE DART: STYLE DO format your code using dart format. CONSIDER changing your code to make it more formatter-friendly. AVOID lines longer than 80 characters. DO use curly braces for all flow control statements. A surprisingly important part of good code is good style. Consistent naming, ordering, and formatting helps code that is the same look thesame.
BUILD_RUNNER
The build_runner package provides general-purpose commands for generating files, and for optionally testing the generated files or serving both source and generated files. Read this page for an overview of using build_runner, with links to where you can find more information. For details of using build_runner with a specific package, see the documentation for that package.DART FIX | DART
dart fix. The dart fix command (added in Dart 2.12) finds and fixes two types of issues: For more information about this and other dart commands, see the Dart command-line tool page. To preview proposed changes, use the --dry-run flag: For information about how automated package API changes work, see dart.dev/go/dart-fix.DART:IO LIBRARY
Only the following can import and use the dart:io library: This library allows you to work with files, directories, sockets, processes, HTTP servers and clients, and more. Many operations related to input and output are asynchronous and are handled using Future s or Stream s, both of which are defined in the dart:async library.TIMER CLASS
Timer. class. A count-down timer that can be configured to fire once or repeatedly. The timer counts down from the specified duration to 0. When the timer reaches 0, the timer invokes the specified callback function. Use a periodic timer to repeatedly count down the same interval. A negative duration is treated the same as a duration of 0. ASYNCHRONOUS PROGRAMMING: FUTURES, ASYNC, AWAIT The asynchronous example is different in three ways: The return type for createOrderMessage () changes from String to Future. The async keyword appears before the function bodies for createOrderMessage () and main (). The await keyword appears before calling the asynchronous functions fetchUserOrder () and createOrderMessage ().ENCODING CLASS
API docs for the Encoding class from the dart:convert library, for the Dart programming language.TAKE METHOD
API docs for the take method from the SecureServerSocket class, for the Dart programming language.__
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Dart is a client-optimized language for fast apps on any platform _play_circle_filled_ Watch video Dart is free and open source __Optimized
for UI
Develop with a programming language specialized around the needs of user interface creationProductive
development
Make changes iteratively: use hot reload to see the result instantlyin your running app
Fast on all
platforms
Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the webOptimized for UI
*
Mature and complete async-await for user interfaces containing event-driven code, paired with isolate-basedconcurrency
*
A programming language optimized for building user interfaces with features such as sound null safety , the spread operatorfor expanding
collections, and collection iffor customizing
UI for each platform*
A programming language that is easy to learn, with a familiar syntax Productive Development*
Make changes to your source code iteratively, using hot reloadto instantly
see the effect in the running app*
Write code using a flexible type system with rich static analysis and powerful, configurable tooling*
Do profiling , logging, and debugging
with
your code editor of choice Fast on all platforms*
AOT-compile apps to native machine codefor instant startup
*
Target the web with complete, mature, fast compilers for JavaScript*
Run backend code supporting your app, written using a single programming languageOptimized for UI
*
Mature and complete async-await for user interfaces containing event-driven code, paired with isolate-basedconcurrency
*
A programming language optimized for building user interfaces with features such as sound null safety , the spread operatorfor expanding
collections, and collection iffor customizing
UI for each platform*
A programming language that is easy to learn, with a familiar syntax Productive development*
Make changes to your source code iteratively, using hot reloadto instantly
see the effect in the running app*
Write code using a flexible type system with rich static analysis and powerful, configurable tooling*
Do profiling , logging, and debugging
with
your code editor of choice Fast on all platforms*
AOT-compile apps to native machine codefor instant startup
*
Target the web with complete, mature, fast compilers for JavaScript*
Run backend code supporting your app, written using a single programming language TRY DART IN YOUR BROWSER Hello worldFunctionsControl flowStringsCollection literalsClassesCompute Pi WANT MORE PRACTICE? TRY A CODELAB . OR DOWNLOAD DART.
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