Angular 5

Angular 5

1. TypeScript

   • TypeScript language, is structured and even more like languages like Java. Typescript = EMCA6 + Types + Annotations  TypeScript gets converted back to compatible JavaScript using a process called transpilation. A transpiler is a piece of software that converts the source code of one language into the source code of another  www.typescriptlang.org/ play/
   • Types(Boolean, Number, String, Array, Enum, Any, Void)
   • Clases and inheritance
   • Interfaces
     • Think of an interface as a promise to do something (for example implement a function in a certain manner) or store certain data (such as properties, arrays). TypeScript interfaces can apply to functions.  TypeScript interfaces can also apply to properties. Interfaces can enforce properties but can also have optional properties (for example, color in the following code): interface LabelledClothing { label: string; size: number; color? : string; }
   • Modules
     • Internal Modules
       • Internal modules are TypeScript’s own approach to modularize code. You use the module keyword to create a module. Internal modules can span across multiple files, effectively creating a namespace. In a browser you load the modules using <script/> tags because there’s no runtime module-loading mechanism. Or you can compile TypeScript files into a JavaScript file that you include with one <script/> tag.
     • External modules
       • These are the types of modules most commonly used when developing in Angular. External modules use a runtime module-loading mechanism.
   • Compilation Options
     • You can configure TypeScript to your tastes: where the source code is located, how strict the compilation is, what compilation checks you want (or don’t want), where the generated transpiled code is located etc. You can configure TypeScript by specifying the configuration options in a JSON-formatted file. Normally this file is called ‘tsconfig.json’ and you will find such a file when you generate your Angular Chapter 4 TypeScript 55 project using the CLI. I have sometimes edited this file to make irrelevant compile checks go way if you are going something unusual. For example if you are using some regular JavaScript code within a TypeScript class.

2. Controllers and components

   • AngularJS used controllers to represent a widget in the user interface on the HTML page. Angular (from version 2 on) replaces controllers with the Component object. Components can have their own tag, such as . Components have a class that contains data and code.

3. Dependency Injection and Constructor Injection

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