Table of Contents
What is symbol in Angular?
The @ symbol you are referring to is called decorator . Decorators provide a way to add both annotations and a meta-programming syntax for class declarations and members. Basically when you are doing @component you are telling compiler that the class is a angular2 component with the metadata passed as an argument.
What is the use of [] in Angular?
Use [] to bind from source to view. Use () to bind from view to source. Use [()] to bind in a two way sequence of view to source to view.
What is #name in Angular?
Angular assigns a template variable a value based on where you declare the variable: If you declare the variable on a component, the variable refers to the component instance. If you declare the variable on an element, the variable refers to a TemplateRef instance, which represents the template.
What does question mark mean in Angular?
In some code snippets, you may have seen that Angular expressions have a question mark after them. Angular refers to it as ‘Safe Navigation Operator’. It makes sure that we are not seeing null and undefined values in our application when we want to access properties of an object.
What does [] mean in Angular?
To bind to an element’s property, enclose it in square brackets, [] , which identifies the property as a target property. A target property is the DOM property to which you want to assign a value. The brackets, [] , cause Angular to evaluate the right-hand side of the assignment as a dynamic expression.
What does means in Angular?
Means safe navigation operator. From Docs. The Angular safe navigation operator (?.) is a fluent and convenient way to guard against null and undefined values in property paths.
What is spread operator in Angular?
The spread operator allows you to easily place an expanded version of an array into another array.
What is double question mark in Angular?
Double question marks(??) or nullish coalescing operator helps us to assign default values to null or undefined variables in Angular and Typescript. It’s often called as Null coalescing operator. It’s introduced as part of Typescript 3.7 version.
What is Dom in Angular?
What is DOM in AngularJS? The logical structure of documents and documents are accessed and manipulated are defined using DOM elements. It defines events, methods, properties for all HTML elements as objects. DOM in AngularJS acts as an API (programming interface) for javascript.
What is DSL in Angular?
A domain-specific language (DSL) is a computer language specialized to a particular application domain. Angular has its own Domain Specific Language (DSL) which allows us to write Angular specific html-like syntax on top of normal html.
What does <> mean in Angular?
Means safe navigation operator. From Docs. The Angular safe navigation operator (?.) is a fluent and convenient way to guard against null and undefined values in property paths. Here it is, protecting against a view render failure if the currentHero is null.
What is the best way to learn AngularJS?
Egghead.io allows beginners to choose from a number of online AngularJS 1.x and 2.x courses. You can select specific course to learn AngularJS fundamentals, application architecture, data modelling, and authentication. At the same time, the courses will help you to understand important features of AngularJS.
What are angular directives?
AngularJS Directives are a combination of HTML template markup (i.e. attributes, elements and CSS class) and supporting the JavaScript code.
What is the difference between AngularJS and JavaScript?
JavaScript vs AngularJS are the two different web technologies used for developing web applications. JavaScript is a programming language whereas AngularJS is an open source framework and based on MVC architecture. JavaScript is mainly written for websites to run in the client’s browser.
What is .subscribe in angular?
In Angular (currently on Angular-6) .subscribe() is a method on the Observable type. The Observable type is a utility that asynchronously or synchronously streams data to a variety of components or services that have subscribed to the observable.