[fluent] dart language (DART language features | JIT instant compilation | AOT static compilation)

I . Dart Language features

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1 . Dart Language features :

① Language type : Strong type language ;

② Compile type :JIT Just in time compilation ; ( Compilation types are JIT / AOT Two types of )

2 . Language type : Strongly typed and weakly typed languages ;

① Strong type language : Each variable must have a specified type ;

② Weak type language : The type of the variable can be specified in advance ;

II . JIT Just in time compilation

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JIT Compile type : Just in time compilation , When the program is running, it runs while explaining ;

① Low efficiency at runtime : When the program is executed , Need to explain , While executing , Efficiency is naturally low , Sometimes in JIT Call in language AOT Language , Can greatly improve efficiency , Such as Java Use in JNI call C ;

② Portability :JIT The language of type is portable , Such as Java , Use Java Compiled bytecode file , Can be in Android , Windows , Linux , MAC On the implementation , No need to compile again ;

III . AOT Static compilation

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AOT Compile type : Static compilation , When developing, it is necessary to compile the code into machine code ; It cannot be ported across platforms ; Very efficient at runtime ;

① High runtime efficiency : In the development stage , Compile the code into machine code , In the process of execution , Just execute , It's very efficient ;

② It's not portable : Such as C/C++ Compile the Static library or dynamic library , Only in one CPU framework / System Up operation , Such as Compile the ARM The static library of the architecture cannot be in x86 Platform operation ( CPU Different architectures ) , Compile the Linux Function library cannot be in Windows Up operation ( The system depends on different libraries ) ;