R.K. Group Interview Questions and Answers

Answers to questions related to Angular frontend development

• To create a custom pipe, use the @Pipe decorator and implement the PipeTransform interface

• Directives in Angular are used to manipulate the DOM and add behavior to elements

• Binding in Angular is used to connect the component class with the template

• Examples of binding include property binding, event binding, and two-way binding

AOT and JIT are compilation techniques in Angular.

• AOT (Ahead-of-Time) compilation is done at build time, converting TypeScript and HTML code into efficient JavaScript code before the browser runs it.

• JIT (Just-in-Time) compilation is done at runtime, converting TypeScript and HTML code into JavaScript code while the application is running.

• AOT improves performance by reducing the size of the bundle and optimizing the code, while JIT may cause a slight delay during the initial l...read more

Data binding is the automatic synchronization of data between the model and view components in an application.

• Data binding allows for the seamless updating of data in the model and reflecting those changes in the view without manual intervention.

• There are two types of data binding in Angular: one-way binding and two-way binding.

• One-way binding updates the view when the model changes, while two-way binding updates both the model and view simultaneously.

• Example: {{ data }} in A...read more

To solve complex problems, break them down into smaller parts, analyze each part, brainstorm solutions, and test them.

• Break down the problem into smaller, more manageable parts

• Analyze each part to understand its function and impact on the overall problem

• Brainstorm potential solutions, considering different perspectives and approaches

• Test the solutions to see which ones work best and iterate as needed

Closure is a function that has access to its own scope, as well as the scope of its outer function.

• A closure allows a function to access variables from its outer function even after the outer function has finished executing.

• Closures are commonly used in JavaScript to create private variables and functions.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }

Directives in Angular are markers on a DOM element that tell Angular to attach a specified behavior to that DOM element or transform the DOM element and its children.

• Directives are used to create reusable components in Angular.

• There are three types of directives in Angular: Component, Structural, and Attribute directives.

• Examples of directives include ngIf, ngFor, and ngStyle.

Observables are streams of data that can be subscribed to, while promises are a single future value.

• Observables can handle multiple values over time, while promises can only handle a single value.

• Observables are cancellable, while promises are not.

• Observables support operators like map, filter, and reduce for data transformation.

• Promises have a simpler API with just then and catch methods.

• Observables are lazy, meaning they won't emit values until someone subscribes to them.

• Pr...read more