CALLBACK A callback is a function that gets invoked after an asynchronous result appears. a callback function is an async function argument. - Asynchronous code result handle using callback and promises. // callback function function with argument // ---argument :// if a function pass-through function as an argument, it is higher-order function. function needs to be called in order to execute. a callback is used when calling a function asynchronous What is a Callback or Higher-order Function? A callback function , also known as a higher-order function, is a function that is passed to another function (let’s call this other function “otherFunction”) as a parameter, and the callback function is called (or executed) inside the otherFunction. A callback function is essentially a pattern (an established solution to a common problem), and therefore, the use of a callback function is also known as a callback pattern. High-order function is a function that takes ...
# FrontEnd Technologies: # Web (Internet) - Html, css framework (bootstrap, material design-> component based) Angular 2 - Single page application (fast). - Web application or website that interacts with the user by dynamically rewritting the current page rather than loading entire new pages from a server. - Can do asynchronous jobs. # Tools: - Typescript - VS code # MVVW (Model View ViewModel Pattern) -> two-way data binding - In angular, the controller (the C in MVC) is replaced by ViewModel (the VM in MVVM). # Typescript Programming Language Typescript (.ts) is imp in angular 2. - supersetup js - strictly typed program - can do class based oop - future programming language. - security maintain (TS code compile and run in js) - JS with additional features. # Data Binding - Controller and Views synchronize. Types: 1. Event - eg: click, onClick, change 2. Property - eg: hide, show 3. 2-way binding - Reflect in view if changes in model- c...
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