APP_INITIALIZER is run when the application starts to initialize. Angular suspend the app initializaction until all the functions provided by the APP_INITALIZER are run.
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Router is used to navigate one page to another page in single page application, also passing multiple praameter and multiple query in the URL
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The port 4200 is default for angular 2 and above version project so that we are unable to run more that project in same time. the alternate way run the project in different port each project.
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Mandate useful tools for your startup
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Routing is used to navigate one component to another component without ever change the URL. Adding routing allow the user to go straight into certain aspects of the application.
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const is a new keyword which declare a variable as constant over time. const in angular 4 we cannot modify
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The difference between var and let. var is scoped to the nearest function block and let is scoped to the nearest enclosing block, which can be smaller than a function block. Both are global if outside any block.
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The @output decorator in angular 4 used to emit the event from child to parent.The basic parent-child and child-parent communication by introducing EventEmitter and @Output.
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The @input decorator in angular 4 used to pass the value from parent to child
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The difference between HTML attribute and DOM property is a important in understanding binding in Angular.
HTML is a set of written instruction for how to display a web page.
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In Angular bootstrapping is a platform specific.
Angular 1 assumed that Angular would only ever be run in a browser, Angular 4 makes no such assumption
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