Sterison Technology Interview Questions and Answers

To connect a component to Redux store, we use the connect function from the react-redux library.

• Import the connect function from react-redux.

• Use the connect function to wrap the component and connect it to the Redux store.

• The connect function takes two parameters: mapStateToProps and mapDispatchToProps.

• mapStateToProps is a function that maps the state from the Redux store to the component's props.

• mapDispatchToProps is ...read more

Context API is a way to share data between components without passing props down manually.

• Context API provides a way to pass data through the component tree without having to pass props down manually at every level.

• It is useful for sharing data that needs to be accessed by many components at different levels of the tree.

• Initial state can be set in Context API using the createContext() function.

• There is no need to have ...read more

Yes, it is mandatory for Reducer to have an initial state.

• Initial state defines the starting point of the state tree.

• It helps in defining the shape of the state tree.

• It is used to set default values for the state properties.

• It is also used to reset the state to its initial values.

• Example: const initialState = { count: 0 };

• Example: const initialState = { name: '', age: 0 };

Minimum coverage for an app and code pushed to production/master branch while deployment.

• Minimum coverage for an app depends on the project requirements and complexity.

• Generally, a coverage of 80% or higher is considered good.

• Code pushed to production/master branch should be thoroughly tested and reviewed.

• Continuous integration and deployment can help automate this process.

• Examples of tools for code coverage include Je

React re-renders just the part of the page that has changed, thanks to its virtual DOM.

• React uses a virtual DOM to track changes in the UI.

• When a component's state or props change, React compares the virtual DOM with the real DOM and updates only the necessary parts.

• This approach improves performance by minimizing the number of DOM manipulations.

• React's diffing algorithm efficiently determines the minimal set of change

Service Workers are scripts that run in the background and can intercept network requests, cache or modify responses.

• Offline support for web applications

• Push notifications

• Background synchronization

• Reduced network usage and faster page loads

• Progressive Web Apps (PWA)

Redux-Saga is a middleware for Redux that handles side effects. Actions can be dispatched from components using mapDispatchToProps.

• Redux-Saga is used to handle side effects like API calls and asynchronous actions.

• It uses generator functions to make asynchronous code look synchronous.

• Sagas listen for specific actions and perform tasks based on those actions.

• To dispatch actions from components, use mapDispatchToProps to ...read more

React lifecycle, Fragment vs React.Fragment, React.PureComponent

• React lifecycle consists of mounting, updating, and unmounting phases

• Fragment is a shorthand for React.Fragment, used to group multiple elements

• React.PureComponent is a class component that implements shouldComponentUpdate method for performance optimization

JavaScript hoisting and differences between let, var and const.

• Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope.

• Var declarations are hoisted to the top of their scope, while let and const declarations are not.

• Var can be redeclared and reassigned, let can be reassigned but not redeclared, and const cannot be reassigned or redeclared.

• Using const is recommend...read more

Prevent rerendering of a child component in React

• Use shouldComponentUpdate() lifecycle method

• Use React.memo() to memoize functional components

• Use PureComponent instead of Component

• Pass props as a callback function to avoid unnecessary re-renders

• Use React.PureComponent for class components

• Use React.memo() for functional components

Print highest element in array of strings

• Convert array elements to integers

• Use built-in max() function

• Print the result

Actions and Action are terms used in automation testing. Actions are a collection of steps while Action is a single step.

• Actions are a set of steps that can be reused in multiple tests

• Action is a single step that performs a specific action

• Actions can be called multiple times in a test

• Action can only be called once in a test

• Actions can be parameterized

• Action cannot be parameterized

To copy Business phone on account to associated contacts and opportunities, use process builder or workflow rule.

• Create a process builder or workflow rule on account object

• Add criteria to check if Business phone is not null

• Add immediate action to update Business phone on associated contacts and opportunities

• Use field update action to update Business phone field on contacts and opportunities

• Map the Business phone field

Yes, CRM deployment can be done using DevOps.

• DevOps can automate the deployment process of CRM systems

• Continuous integration and continuous deployment can be used for CRM deployment

• DevOps tools like Jenkins, Ansible, and Puppet can be used for CRM deployment

• DevOps can ensure faster and more efficient deployment of CRM systems

Data export service is a tool that allows users to export data from Dynamics 365 to an Azure SQL database or a CSV file.

• Data export service is a cloud-based service provided by Microsoft.

• It can be used to export data from Dynamics 365 to an Azure SQL database or a CSV file.

• It can be scheduled to run automatically or manually.

• It can be used to export data from both standard and custom entities.

• It can be used to export d...read more

Use alternative method or optimize plugin to reduce time.

• Optimize the plugin code to reduce execution time.

• Use a different plugin that can perform the same operation faster.

• Write custom code to achieve the same operation without using the plugin.

• Break down the operation into smaller tasks and execute them in parallel.

• Use caching to store results and avoid repeating the operation.

• Consider upgrading hardware or increasin

Tags are labels or keywords that are used to categorize and organize content.

• Tags are commonly used on social media platforms to group posts with similar content.

• They can also be used on websites to help users find related content.

• Tags can be created by users or automatically generated based on the content.

• They are often displayed as clickable links that lead to a list of other content with the same tag.

Default ads are pre-designed advertisements that are displayed when no other ads are available.

• Default ads are used as a backup when there are no other ads to display.

• They are pre-designed and can be created by the ad network or the website owner.

• Default ads are usually less effective than targeted ads.

• They can be used to promote the website or a specific product or service.

• Default ads can also be used to fill empty ad