Thevady Consultants Interview Questions and Answers

Static testing is done without executing the code, while dynamic testing involves executing the code.

• Static testing is performed during the early stages of development to prevent defects from entering the codebase.

• Dynamic testing is done during the later stages of development to validate the behavior of the software.

• Examples of static testing include code reviews, walkthroughs, and inspections.

• Examples of dynamic testing include unit testing, integration testing, and system t...read more

React component life cycle includes mounting, updating, and unmounting.

• Mounting: when a component is created and inserted into the DOM

• Updating: when a component is updated due to changes in props or state

• Unmounting: when a component is removed from the DOM

• Methods like componentDidMount, componentDidUpdate, and componentWillUnmount are used to manage the life cycle

• Example: componentDidMount is called after a component is mounted and can be used to fetch data from an API

Regression testing is the process of retesting a software application to ensure that new code changes have not adversely affected existing functionality.

• Regression testing is performed after code changes to verify that the existing features still work correctly.

• It helps in identifying any defects introduced by new code changes.

• Automated testing tools are often used for regression testing to save time and effort.

• Regression testing can be done manually as well, but it is more t...read more

let, var, and const are JavaScript keywords used for declaring variables with different scoping and mutability.

• let and const were introduced in ES6 while var has been used since the beginning of JavaScript.

• let and const have block-level scoping while var has function-level scoping.

• let and var are mutable while const is immutable.

• let can be reassigned while const cannot be reassigned.

• const must be initialized during declaration while let and var can be initialized later.

• Exampl...read more

The lifecycle of a component refers to the different stages a component goes through from creation to deletion.

• Mounting: When a component is created and inserted into the DOM.

• Updating: When a component's state or props change.

• Unmounting: When a component is removed from the DOM.

• Examples of lifecycle methods include componentDidMount, componentDidUpdate, and componentWillUnmount.

• Lifecycle methods can be used to perform actions at specific stages of a component's lifecycle.