Unstop Softwaretest Engineer Interview Questions and Answers

Q1. Let var const difference
Ans. 
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
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Q2. Polyfills of bind method
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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
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Q1. Make a search bar in React
Ans. 
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
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Q2. React js core concepts
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Q1. How you structure your work
Ans. 
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
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Q2. How you make a project from scratch
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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
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Q1. Lazy loading in react
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Q2. Cache bursting
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Q3. Difference between == and ===
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Q1. Promises in javascript
Ans. 
Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.
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2 questions, Easy and medium based

Q1. Stacks queues and array questions
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Q1. Technical questions on projects
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Q1. How to tackle any uncertain situations? Behavioural questions
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Maths test and coding mcq quesions

Q1. Java oops questions
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Q2. Diff between method overloading and overriding , integation class obj
Ans. 
Method overloading is having multiple methods in the same class with the same name but different parameters. Method overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
• Method overloading is resolved at compile time based on the method signature, while method overriding is resolved at runtime based on the object type.

• In method overloading, the return type can be di...read more
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Q1. Implement cache in the given architecture where read and write both are pretty frequent. What are the cache eviction mechanisms and which one should we follow here ?
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Q2. Rotten oranges - leetcode graph question
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