Blue%20Binaries Interview Questions

🏢 Blue Binaries

🛠️ Role: React-js Fullstack Developer 📍 Location: Bangalore, India 👤 Recruiter name: Anupama

Round 1 – Technical Interview 👤 Interviewer name: Naveen Murugesan

Tell me about yourself
Can you list of some semantic of HTML?
What is the d/f b/w ID and Class?
What is the purpose of alt attribute in image tag?
What about the meta tags?
What are the d/f b/w bold tag and strong tag?
What is void elements?
What are the d/f b/w inline and block?
What is the use of doctype in html?
What is the d/f b/w visibility and hidden?
Are aware about media queries?
What is the use of calc() in css?
What is sudo class?
what is scss and what is use of mixin file ?
Can we use variable in css?
What is D/f b/w rem and px?
explain the d/f b/w let and const?
What are the array method have you used in js?
D/w b.w map, filter and foreach?
what is the d/f b/w == and ===?
d/f b/w null and undefined?
d/f b/w async-await vs promise?

  •   Promise.resolve().then(function b() {
          console.log('promise');
      });
  •   setTimeout (function a() {
          console.log( 'setTimeout');
      }, 0);
      let a = 5;
      console.log(a);

What is curring?
Write a function sum that will be use like this js sum(1)(2)(3) output will the addition of all arguments?
What is callback?
What is HOC?
What is IIFE?
What is microtask and macrotask?
Swap number without variable in js?
Create a function to check is number even or odd?
Remove Duplicate from array without in-built function
Maximum Product Subarray

Write a function that will check the marks of students if it is in b/w or equal to 75 to 80 then give the 5 marks as grace such as: I/P:

const students = [
    { name: "Alice", mark: 85 },
    { name: "Bob", mark: 78 },
    { name: "Charlie", mark: 72 }
];

O/P:

const students = [
    { name: "Alice", mark: 85 },
    { name: "Bob", mark: 83 },
    { name: "Charlie", mark: 72 }
];

What is virtual dom?
What is jsx in react js?
Can you differentiate props and state?
Can you explain me what is use key attribute in react js?
What is the use of react fragment?
D/f b/w use callback and useMemo?
What is prop drilling?
What is controlled and uncontrolled component?
D/f b/w class component and functional component?
Explain the use of useEffect?
What are the hooks are you using in day to day coding?
Can you explain the lifecycle of Redux?

Round 2 – Technical Interview (Telephonic Call)

Tell about some technical skills and experience.
Which method are you following for development life cycle?
What is agile?
What is story pointer and how will you decide what will be the pointer for particular story?
Let's consider developer have a store 3 pointer and sprint have 15 days so how much time developer should take how will you decide?
Which aws services have you worked?

Round 3 – Technical Interview

  var name = 'random'
  
  function test() {
      console.log(name) //undefined
      var name = 'random again'
  }
  test()


  let a = true 
  setTimeout(() => {
  a = false
  }, 2000)

  while(a) {
  console.log("hello")
  }


  const p = new Promise((resolve, b) => {
  setTimeout(()=>{
      resolve(2);
  }, 10);
  resolve(4);
  })
  
  p.then((r) => console.log(r))
  .then((p) => console.log(p))
  .finally(()=> console.log(888)) 
  .then(z => console.log(z))

Round 4 – Manger round