A tour of the Dart language

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If and else

来源 1 浏览 469 扫码打印 2019-12-15 11:24:25

Unlike JavaScript, conditions must use boolean values, nothing else. See for more information.

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A basic Dart program
Classes
- Using class members
- Extension methods
- Enumerated types
- Adding features to a class: mixins
- Class variables and methods
- Using constructors
- Getting an object’s type
- Instance variables
- Constructors
- Methods
- Abstract classes
- Implicit interfaces
- Extending a class
Generics
- Why use generics?
- Using collection literals
- Using parameterized types with constructors
- Generic collections and the types they contain
- Restricting the parameterized type
- Using generic methods
Libraries and visibility
- Using libraries
- Implementing libraries
Asynchrony support
- Handling Futures
- Declaring async functions
- Handling Streams
Generators
Callable classes
Isolates
Typedefs
Metadata
Comments
Important concepts
Summary
Keywords
Variables
- Default value
- Final and const
Built-in types
- Numbers
- Strings
- Booleans
- Lists
- Sets
- Maps
- Runes and grapheme clusters
- Symbols
Functions
- Optional parameters
- The main() function
- Functions as first-class objects
- Anonymous functions
- Lexical scope
- Lexical closures
- Testing functions for equality
- Return values
Operators
- Arithmetic operators
- Equality and relational operators
- Type test operators
- Assignment operators
- Logical operators
- Bitwise and shift operators
- Conditional expressions
- Cascade notation (..)
- Other operators
Control flow statements
- If and else
- For loops
- While and do-while
- Break and continue
- Switch and case
- Assert
Exceptions
- Throw
- Catch
- Finally
A tour of the Dart language

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