Relevantz Technology Services Angular Frontend Developer Interview Questions and Answers

Q1. What are AOT and JIT in Angular?
Ans. 
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 cod...read more
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Q2. Observables vs promises
Ans. 
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 ...read more
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Q3. What is data binding and types?
Ans. 
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 ...read more
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Q4. What is closure?
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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(oute
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Q5. Lazyloading in angular
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Lazy loading in Angular is a technique used to load modules only when they are needed, improving performance.
• Lazy loading helps reduce initial load time by loading modules on demand

• Implemented using loadChildren property in routes configuration

• Lazy loaded modules have their own routes and components
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Q6. Directives in Angular and Types
Ans. 
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.
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