Altimetrik Interview Questions, Process, and Tips

Q1. What is the difference between a Subject and an Observer?
Ans. 
Subjects are multicast observables that can emit values, while observers are consumers that react to those emitted values.
• A Subject can emit values to multiple subscribers, while an Observer receives values from a Subject.

• Example of Subject: const subject = new Subject(); subject.next('Hello');

• Example of Observer: const observer = { next: (value) => console.log(value); }; subject.subscribe(observer);

• Subjects can act...read more
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Q2. What is the difference between components and directives?
Ans. 
Components are self-contained UI elements, while directives are used to extend HTML behavior.
• Components are a complete UI element with a template, styles, and logic (e.g., <app-header>).

• Directives are used to manipulate the DOM or enhance existing elements (e.g., ngIf, ngFor).

• Components can have their own view and encapsulated styles, while directives do not have their own view.

• Components are typically used for b...read more
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Q3. What are Angular guards?
Ans. 
Angular guards are interfaces that control access to routes in an Angular application.
• Types of guards: CanActivate, CanActivateChild, CanDeactivate, Resolve, and CanLoad.

• CanActivate: Determines if a route can be activated. Example: Checking user authentication.

• CanDeactivate: Checks if a user can leave a route. Example: Unsaved changes warning.

• Resolve: Pre-fetches data before activating a route. Example: Fetching user d...read more
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Q4. What are template-driven forms?
Ans. 
Template-driven forms in Angular use HTML templates to manage form inputs and validation, simplifying form handling.
• Built using Angular's directives like ngModel for two-way data binding.

• Forms are defined in the template, making them easy to read and maintain.

• Validation is handled using Angular's built-in validators, such as required or minlength.

• Example: <input [(ngModel)]='user.name' required /> binds the input...read more
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Q5. What is the ChangeDetectionStrategy in Angular?
Ans. 
ChangeDetectionStrategy in Angular determines how the framework checks for changes in component data.
• Angular provides two strategies: Default and OnPush.

• Default strategy checks all components in the component tree for changes.

• OnPush strategy only checks the component when its input properties change or an event occurs.

• Using OnPush can improve performance by reducing the number of checks.

• Example: @Component({ changeDete
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Q6. How can we implement asynchronous behavior in JavaScript?
Ans. 
Asynchronous behavior in JavaScript allows non-blocking operations, enhancing performance and user experience.
• 1. Callbacks: Functions passed as arguments to handle asynchronous results. Example: setTimeout(() => console.log('Done!'), 1000);

• 2. Promises: Objects representing eventual completion (or failure) of an asynchronous operation. Example: const promise = new Promise((resolve, reject) => { /* ... */ });

• 3. Asy...read more
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Q7. What is the difference between var, let, and const in JavaScript?
Ans. 
var, let, and const are used for variable declaration in JavaScript, differing in scope, hoisting, and mutability.
• var is function-scoped or globally scoped, while let and const are block-scoped.

• let allows variable reassignment, whereas const does not allow reassignment after initial assignment.

• var is hoisted, meaning it can be used before its declaration, while let and const are not hoisted in the same way.

• Example: var...read more
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Q8. What are the new semantic elements introduced in HTML5?
Ans. 
HTML5 introduced new semantic elements to enhance the structure and meaning of web content.
• header: Represents introductory content or navigational links. Example: <header><h1>Site Title</h1></header>

• footer: Defines footer for a section or page. Example: <footer><p>© 2023 Company Name</p></footer>

• article: Represents a self-contained composition. Example: <article><...read more
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Q9. What is the purpose of the doctype declaration in HTML?
Ans. 
The doctype declaration informs the browser about the HTML version being used, ensuring proper rendering of the document.
• Defines the document type and version of HTML (e.g., <!DOCTYPE html> for HTML5).

• Helps browsers render the page correctly by switching to standards mode.

• Prevents browsers from entering quirks mode, which can lead to inconsistent rendering.

• Affects how CSS and JavaScript are interpreted by the bro
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Q10. What is the difference between Flexbox and Grid layout in CSS?
Ans. 
Flexbox is for one-dimensional layouts, while Grid is for two-dimensional layouts in CSS.
• Flexbox is designed for layout in a single direction (row or column). Example: Aligning items in a navbar.

• Grid allows for layout in both rows and columns simultaneously. Example: Creating a complex web page layout.

• Flexbox is great for distributing space within a container. Example: Equal spacing between buttons.

• Grid is better for c...read more
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Q1. Types of job in kotlin coroutine
Ans. 
Types of jobs in Kotlin coroutine include launch, async, withContext, and runBlocking.
• launch: starts a new coroutine without blocking the current thread

• async: starts a new coroutine and returns a Deferred object with a result

• withContext: switches the coroutine context within a coroutine

• runBlocking: blocks the current thread until the coroutine inside it is completed
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Q2. What is Flow, Channel diffrent between StateFlow and SharedFlow
Ans. 
Flow is a cold asynchronous data stream, Channel is a hot asynchronous data stream. StateFlow is a hot asynchronous data stream with a state, SharedFlow is a hot asynchronous data stream without a state.
• Flow is a cold asynchronous data stream that emits values one by one.

• Channel is a hot asynchronous data stream that can have multiple subscribers.

• StateFlow is a hot asynchronous data stream that retains the most recent ...read more
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Q3. If Flow lifecycle aware
Ans. 
Flow lifecycle aware means using Kotlin Flow with lifecycle awareness in Android development.
• Flow lifecycle aware helps manage data streams in Android apps

• It ensures that data emissions are only observed when the lifecycle is in the appropriate state

• Example: Using Flow with LiveData to update UI components based on lifecycle events
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Q4. What is inline function and highorder function?
Ans. 
Inline functions are functions that are expanded in place at the call site, while high-order functions are functions that can take other functions as parameters or return them.
• Inline functions are expanded in place at the call site to improve performance.

• High-order functions can take other functions as parameters or return them.

• Example of high-order function: map() function in Kotlin.
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Data structure was more and it was difficult round

Q1. It will depend on interviewer
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Q1. It will be depending on Manager who is taking interview
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Q1. It will be very smooth
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