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Commit 2a31901

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‎README.md

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@@ -22,7 +22,7 @@ A: A variable (defined using a #) in a component template, which can be referenc
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**What are the possible ways to bind component properties to an associated template?**
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A: interpolation binding, one way binding, two way binding.
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A: Interpolation binding, one way binding, two way binding.
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## Component/Directive Questions
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**What is the purpose of NgModule?**
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A: to give Angular information on a particular module’s contents, through decorator properties like: declarations, imports, exports, providers, etc.
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A: It's to give Angular information on a particular module’s contents, through decorator properties like: declarations, imports, exports, providers, etc.
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**How do you decide to create a new NgModule?**
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A: Typically for a nontrivial feature in an application, that will involve a collection of related components and services.
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**What are the attributes that you can define in an NgModule annotation?**
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A: declarations, imports, exports, providers, bootstrap
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A: Declarations, imports, exports, providers, bootstrap
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**What is the difference between a module's forRoot() and forChild() methods and why do you need it?**
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A: forRoot and forChild are conventional names for methods that deliver different import values to root and feature modules.
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**What would you have in a shared module?**
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A: common components, directives, and pipes used in other modules in your application.
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A: Common components, directives, and pipes used in other modules in your application.
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**What would you not put shared module?**
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A: services that should not have multiple instances created for the application.
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A: Services that should not have multiple instances created for the application.
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**What module would you put a singleton service whose instance will be shared throughout the application (e.g. ExceptionService andLoggerService)?**
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A: Root Module
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**What is the purpose of exports in an NgModule?**
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A: provide components, directives, pipes to other modules for their usage.
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A: Provide components, directives, pipes to other modules for their usage.
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**Why is it (potentially) bad if SharedModule provides a service to a lazy loaded module?**
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A: You will have two instances of the service in your application, which is often not what you want.
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**Can we import a module twice?**
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A: yes, and the latest import will be what is used.
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A: Yes, and the latest import will be what is used.
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**Can you re-export classes and modules?**
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**How would you make use of onNgInit()?**
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PA: fetch initial component data (e.g. from server).
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PA: Fetch initial component data (e.g. from server).
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**What would you consider a thing you should be careful doing on onNgInit()?**
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A: You cannot expect the component's children's data-bound properties to have been checked at this point.
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**What is the difference between onNgInit() and constructor() of a component?**
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A: a directive’s data-bound input properties are not set until after construction, so that’s one difference.
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A: A directive’s data-bound input properties are not set until after construction, so that’s one difference.
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## Pipes Questions:
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**What is an async pipe?**
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A: an impure pipe that accepts a promise or observable as input and eventually returns emitted values.
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A: An impure pipe that accepts a promise or observable as input and eventually returns emitted values.
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**What kind of data can be used with async pipe?**
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A: stateful, asynchronous
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A: Stateful, asynchronous
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**What types of pipes are supported in Angular 2?**
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**How does loadChildren property work?**
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A: the Router calls it to dynamically load lazy loaded modules for particular routes.
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A: The Router calls it to dynamically load lazy loaded modules for particular routes.
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**When does a lazy loaded module get loaded?**
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**How do you reference the host of a component?**
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A: let DI inject an ElementRef into the constructor of your component.
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A: Let DI inject an ElementRef into the constructor of your component.
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**What pseudo-class selector targets styles in the element that hosts the component?**
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A: The :host pseudo class selector.
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**How would you select all the child components' elements?**
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A: with the @ViewChildren decorator, like for example:
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A: With the @ViewChildren decorator, like for example:
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`@ViewChildren(ChildDirective) viewChildren: QueryList<ChildDirective>;`
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**How would you select a css class in any ancestor of the component host element, all the way up to the document root?**
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A: using the :host-context() pseudo-class selector.
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A: Using the :host-context() pseudo-class selector.
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**What selector force a style down through the child component tree into all the child component views?**
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A: use the /deep/ selector along with :host pseudo-class selector.
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A: Use the /deep/ selector along with :host pseudo-class selector.
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**What does :host-context() pseudo-class selector target?**
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**What's the difference between dirty, touched, and pristine on a form element?**
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A: dirty means it contains user data, touched means the user has at least done something with a particular control (perhaps just literally ‘touched’ it by giving it focus?), and pristine means the control has not been touched at all by the user.
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A: Dirty means it contains user data, touched means the user has at least done something with a particular control (perhaps just literally ‘touched’ it by giving it focus?), and pristine means the control has not been touched at all by the user.
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**How can you access validation errors in the template to display error messages?**
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PA: use formErrors
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PA: Use formErrors
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**What is async validation and how is it done?**
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A: verifying some field using some asynchronous call (perhaps a server call)... return a `Promise<ValidationResult>` from your validator. When creating a FormControl object, you can pass an asynchronous validator into the constructor (e.g. `new FormControl(‘value’, syncValidator, asyncValidator)`).
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A: Verifying some field using some asynchronous call (perhaps a server call)... return a `Promise<ValidationResult>` from your validator. When creating a FormControl object, you can pass an asynchronous validator into the constructor (e.g. `new FormControl(‘value’, syncValidator, asyncValidator)`).
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## Architecture Questions:
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**What is a good use case for ngrx/store?**
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A: complex application state management requirements, involving asynchronous requests to update state...
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A: Complex application state management requirements, involving asynchronous requests to update state.
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**What would be a good use case for having your own routing module?**
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