IBM
HDFC Bank Interview Questions and Answers
Q1. Router components service angular performance optimization how to scale app, security
Optimizing Angular app performance and security with router components and services
Use lazy loading to improve performance
Implement caching for frequently accessed data
Use Angular Universal for server-side rendering
Implement HTTPS and secure authentication for security
Use guards and interceptors to protect routes and prevent unauthorized access
Q2. 3.How to make a class immutable
To make a class immutable, we need to ensure that its state cannot be modified after creation.
Make all fields private and final
Do not provide any setters
If mutable objects are used, return copies instead of references
Ensure that any methods that modify state return a new instance instead of modifying the existing one
Q3. What is hoisting in Java script
Hoisting in JavaScript is a behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase.
Variable declarations are hoisted to the top of their scope, but not their initializations.
Function declarations are fully hoisted, including their definitions.
Hoisting can lead to unexpected behavior if not understood properly.
Q4. 4.React life cycle methods
React life cycle methods are functions that are called at different stages of a component's life cycle.
There are three phases of a component's life cycle: Mounting, Updating, and Unmounting.
Mounting phase includes constructor(), getDerivedStateFromProps(), render(), and componentDidMount() methods.
Updating phase includes getDerivedStateFromProps(), shouldComponentUpdate(), render(), getSnapshotBeforeUpdate(), and componentDidUpdate() methods.
Unmounting phase includes componen...read more
Q5. What is promise, closure ?
A promise is an object representing the eventual completion or failure of an asynchronous operation. A closure is a function defined within another function that has access to its parent function's scope.
Promise is used to handle asynchronous operations in JavaScript.
Promises can be in one of three states: pending, fulfilled, or rejected.
Closures allow functions to access variables from their parent function even after the parent function has finished executing.
Closures are c...read more
Q6. Functional Overloading vs function overriding
Functional overloading involves multiple functions with the same name but different parameters, while function overriding involves a subclass providing a specific implementation for a method in its superclass.
Functional overloading allows multiple functions with the same name but different parameters.
Function overriding occurs in inheritance when a subclass provides a specific implementation for a method in its superclass.
In functional overloading, the compiler determines whi...read more
Q7. Tell about design pattern
Design patterns are reusable solutions to common problems in software design.
Design patterns help in creating maintainable, scalable, and efficient code.
Some common design patterns include Singleton, Factory, Observer, and Strategy.
Design patterns can be categorized into three main groups: creational, structural, and behavioral.
Q8. What is memonisation
Memoization is a technique used in computer science to store the results of expensive function calls and return the cached result when the same inputs occur again.
Memoization helps in improving the performance of a program by reducing redundant calculations.
It is commonly used in dynamic programming to optimize recursive algorithms.
Example: Fibonacci sequence calculation can be optimized using memoization to store previously calculated values.
Q9. Difference between == && ===
== is used for equality comparison, while === is used for strict equality comparison.
== checks for equality of values, while === checks for equality of values and data types.
== can perform type coercion, while === does not.
== is less strict than ===.
Example: 1 == '1' returns true, but 1 === '1' returns false.
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