The Angular app consists of many components, including HTML templates, TypeScript files, and files for unit testing and configuration. So, when we load and run the app, the browser is incapable of understanding the code, which is why we have to use a compiler. A compiler compiles the code for better running in a browser. AOT – Ahead of Time; JIT – Just In Time are the compilers used if an app is based on the Angular framework.
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About Ahead of Time – AOT Compiler
Ahead of Time [AOT] is a compiling language approach where intermediate or high-level languages are compiled into native machine codes for better system understanding.
When it comes to its work, if you use the Ahead of Time compiler as part of your Angular application, the compiler processes and converts the code into native code even before the browser runs the code.
The work of the compiler here starts even before the downloading of the code to the browser. Since the version of Angular 9, Ahead Of Time is set as the default compiling option. Adding the “-AoT” at the end does the trick. For example – “ng serve -aot“.
Why Use Ahead Of Time [AOT] Compiler
- If you use an AOT compiler, compiling happens only once, directly during app building.
- There is no need to ship HTML templates and the Angular compiler whenever a new component is entered.
- The application size can be minimised.
- Browsers need not compile the app code during runtime. The application can be directly rendered without the need of waiting for the compilation first. So the component rendering happens quickly.
- AOT Compiler makes early detection of template errors possible. During the early building steps, template errors are detected and reported.
- AOT offers greater security. Even before the client displays all the templates and HTML components, they are compiled into JavaScript files. So there is no risk of clients or external parties reading the files. This minimises injection attack chances drastically.
About Just In Time [JIT] Compiler
Just in Time compiler compiles the code parallelly just before the program is executed in the execution process.
To put it this way, the code is compiled just at the time when it is needed, not during the building phase. As its name suggests, Just In Time compiles the code only when it needs to be compiled for the right execution, not during its build time. That is the Just in Time compiler for you.
Why use the Just In Time [JIT] Compiler?
- JIT compiler separately compiles every file. The files are compiled in the browser itself.
- So one need not build their project after the code change.
- As the predominant compiling is done on the browser side, the compilation process takes very less time.
- So, do you know when the Just in Time compiler is useful? JIT Compiler is useful in a big project in which you don’t use most of its components for most of the building time.
- Also, if your app is in local development, then JIT Compiler is the best.
These are the important aspects to learn about the AOT compiler as well as the JIT compiler. They are essentially used in the famous Angular app development, so everyone involved in the app-building needs to be aware of them. However, choose low-code app development if you feel all these typical app developments are hectic.
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