E-DAC Learning Solutions Interview Questions and Answers

ACID properties are a set of properties that guarantee reliable and consistent transactions in a database system.

• Atomicity ensures that either all operations in a transaction are completed successfully or none at all.

• Consistency ensures that the database remains in a valid state before and after the transaction.

• Isolation ensures that the concurrent execution of transactions results in a system state that would be obtai...read more

Idempotent HTTP requests are requests that can be repeated multiple times without changing the result beyond the initial request.

• Idempotent requests have the same outcome no matter how many times they are executed.

• GET, PUT, and DELETE HTTP methods are typically idempotent.

• POST requests are not idempotent as they can create new resources with each execution.

var, let, and const are all used to declare variables in JavaScript, but they have different scopes and mutability.

• var is function-scoped and can be redeclared and reassigned

• let is block-scoped and can be reassigned but not redeclared

• const is block-scoped and cannot be reassigned or redeclared

Polyfills of bind method provide a way to use the bind method in older browsers that do not support it natively.

• Polyfill code typically checks if the bind method is available and if not, it creates a new function that mimics the behavior of bind.

• One common polyfill for the bind method is the following: Function.prototype.bind = Function.prototype.bind || function() { // polyfill code here };

• Polyfills are often used to ...read more

Create a search bar component in React for filtering data

• Create a functional component for the search bar

• Use state to store the search query

• Implement a onChange event handler to update the search query

• Filter the data based on the search query

I structure my work by breaking down tasks, setting priorities, creating timelines, and regularly reviewing progress.

• Break down tasks into smaller, manageable chunks

• Set priorities based on deadlines and importance

• Create timelines to track progress and ensure timely completion

• Regularly review progress and adjust plans as needed

To make a project from scratch, start by defining requirements, creating a plan, designing the architecture, implementing the code, testing, and deploying.

• Define project requirements and goals

• Create a project plan with timelines and milestones

• Design the architecture of the project, including database schema and system components

• Implement the code following best practices and coding standards

• Test the project thoroughly ...read more

Use Boyer-Moore Majority Vote Algorithm to find element with count more than n/2.

• Initialize candidate element and count

• Iterate through array, updating count if same as candidate or decrementing if different

• If count becomes 0, update candidate element

• Iterate again to confirm candidate element count is more than n/2

Sales and marketing funnels are interconnected processes that guide potential customers from awareness to purchase.

• Sales funnel focuses on converting leads into customers through direct sales tactics.

• Marketing funnel focuses on generating awareness and interest in a product or service.

• Marketing activities feed into the top of the sales funnel by attracting potential customers.

• Sales activities further qualify and nurtur...read more

Public, private, and protected are access modifiers used in object-oriented programming to control the visibility of class members.

• Public: accessible from outside the class

• Private: only accessible within the class

• Protected: accessible within the class and its subclasses