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All front end Interview questions asked during my recent job hunt.

devabhijeet profile image Abhijeet Yadav Updated on ・13 min read


Interview questions for front end



This readme is a compilation of all the question asked during my recent COVID-19 job hunt. I've also attached a list of resources that I'd referred for the preparations.


The questions are divided into following sections.

  • JS
  • Coding
  • Assignments
  • Miscellaneous

The solution are not production ready code and just represents a rough idea of my approach. Try implementing your own approach.

Edits made on 20/08/2020. Click to view changes

JS

1) Given a multidimensional array with depth of n, flatten it. Once flattened make it available as a method on array instance

Solution

/**
 * [1,2,[3,4]] -> [1,2,3,4]
 */

let arr = [1,2,[3,4, [5,6, [7, [8, 9, 10]]]]]

function flatten(arr) {
  return arr.reduce(function(acc, next){
    let isArray =  Array.isArray(next)
    return acc.concat(isArray ? flatten(next) : next)
  }, [])
}

if (!Array.prototype.flatten) {
  Array.prototype.flatten = function() {
    return flatten(this)
  }
}
console.log(arr.flatten());

2) Create a promise from scratch

Solution

class CustomPromise {
  state = "PENDING"
  value = undefined
  thenCallbacks = []
  errorCallbacks = []

  constructor(action) {
    action(this.resolver.bind(this), this.reject.bind(this))
  }

  resolver(value) {
    this.state = "RESOLVED"
    this.value = value
    this.thenCallbacks.forEach((callback) => {
      callback(this.value)
    })
  }

  reject(value) {
    this.state = "REJECTED"
    this.value = value
    this.errorCallbacks.forEach((callback) => {
      callback(this.value)
    })
  }

  then(callback) {
    this.thenCallbacks.push(callback)
    return this 
  }

  catch (callback) {
    this.errorCallbacks.push(callback)
    return this 
  }
}

let promise = new CustomPromise((resolver, reject) => {
  setTimeout(() => {
    const rand = Math.ceil(Math.random(1 * 1 + 6) * 6)
    if (rand > 2) {
      resolver("Success")
    } else {
      reject("Error")
    }
  }, 1000)
})

promise
  .then(function(response){
    console.log(response)
  })
  .catch(function(error){
    console.log(error)
  })

3) Filter movie list by average rating, name. Sort filtered list by any field inside movie object

Solution

// O(M)
function getMovies() {
  return []; // [{id, name, year}]
}

// O(R)
function getRatings() {
  return []; // [{id, movie_id, rating}]   0 <= rating <= 10   // e.g 9.3
}

/**
 * minAvgRating ->
 *    avgRating >= minAvgRating
 *
 * sort ->
 *    name -> ascending order movies by name
 *   -name -> descending
 *
 *    avgRating
 * 
 *
 * search ->
 *   'ave' -> 'Avengers'
 *   'avengers' -> 'Avengers'
 *   'AvengersInfinitywar' -> 'Avengers'
 */
const toLower = str => str.toLocaleLowerCase()

const getAvrgRating = (movie, movingWithRatings) => {
  let count = 0;
  return movingWithRatings.reduce((acc, value, index) => {
    const movieMatch = movie.id === value.movie_id
    if (movieMatch) {
      acc+=value.rating
      count++
    }
    if (index === movingWithRatings.length - 1) {
      acc = acc/count
    }
    return acc
  }, 0)
}

const isSubString = (str1, str2) => {
  str1 = toLower(str1.split(" ").join(""))
  str2 = toLower(str2.split(" ").join(""))
  if (str1.length > str2.length) {
    return str1.startWith(str2)
  } else {
    return str2.startWith(str1)
  }
}

const moviesList = getMovies()
const movingWithRatings = getRatings();
function queryMovies({ search, sort, minAvgRating }) {
  let filteredMovies = movingWithRatings.filter(movie => getAvrgRating(movie, movingWithRatings) >= minAvgRating);
  filteredMovies = filteredMovies.map(movie => moviesList.filter(listItem => listItem.id === movie.movie_id).pop())
  filteredMovies = filteredMovies.filter(movie => isSubString(toLower(movie.name), toLower(search)))
  filteredMovies = filteredMovies.sort((a, b) => {
    const isDescending = sort[0] === '-' ? true : false
    let sortCopy = isDescending ? sort.slice(1) : sort
    const value1 = a[sortCopy]
    const value2 = b[sortCopy]
    if (isDescending) {
      return value1 > value2 ? -1 : 1
    }else {
      return value1 < value2 ? -1 : 1
    }
  })
  filteredMovies = filteredMovies.map(movie => ({
    ...movie,
    avgRating: movingWithRatings.filter(ratedMovie => ratedMovie.movie_id === movie.id)[0].rating
  }))
  return filteredMovies
}

4) Given an end point URL to fetch all the posts and comments. Do the following.

  • Map all the comments to the posts it belongs to. The resultant data after mapping should be of below structure.

Solution


//service.js
const POSTS_URL = `https://jsonplaceholder.typicode.com/posts`;
const COMMENTS_URL = `https://jsonplaceholder.typicode.com/comments`;

export const fetchAllPosts = () => {
  return fetch(POSTS_URL).then(res => res.json());
};

export const fetchAllComments = () => {
  return fetch(COMMENTS_URL).then(res => res.json());
};


import { fetchAllPosts, fetchAllComments } from "./service";



const fetchData = async () => {
  const [posts, comments] = await Promise.all([
    fetchAllPosts(),
    fetchAllComments()
  ]);

  const grabAllCommentsForPost = postId =>
    comments.filter(comment => comment.postId === postId);

  const mappedPostWithComment = posts.reduce((acc, post) => {
    const allComments = grabAllCommentsForPost(post.id);
    acc[post.id] = allComments;
    return acc;
  }, {});

  console.log("mappedPostWithComment ", mappedPostWithComment);
};

fetchData();

5) Implement a method getHashCode on string instance. The method should be available on all strings.

Solution

let s1 = "sample"

if (!String.prototype.getHashCode) {
  String.prototype.getHashCode = function(){
    console.log('String instance ', this)
    return this
  }
}

6) What does the below expressions evaluate to

    1+true
    true+true
    1+true
    2 > 3
    two>three

Solution

2
2
1true
false
true

7) Implement bind and reduce.

Solution


//bind
if (!Function.prototype.bind) {
  Function.prototype.bind = function(...arg){
    const func = this
    const context = arg[0]
    const params = arg.slice(1)
    return function(...innerParam) {
      func.apply(context, [...params, ...innerParam])
    }
  }
}

//reduce
Array.prototype.reduce = function(func, initState) {
  const arr = this
  const callback = func
  let init = initState

  arr.forEach(function(value, index){
      init=callback(init, value)
  })
  return init
}

8) Implement debounce function

Solution

const debounce = function(func, interval) {
  let timerId;
  return function(e){
    clearTimeout(timerId)
    timerId = setTimeout(function(){
      func.apply()
    }, interval)
  }
}
debounce(apiCall, 3000)

9) Implement throttling function

Solution

const throttle = (callback, interval) => {
  let timerId;
  let allowEvents = true;

  return function() {
    let context = this;
    let args = arguments;

    if (allowEvents) {
      callback.apply(context, args)
      allowEvents = false;
      timerId = setTimeOut(function(){
        allowEvents = true
      }, interval)
    }
  }
}

10) Design API polling mechanism. The API is called after a fixed interval. The API is a stock API that fetches the latest price of stock. Upon fetching the results, render the UI.

The question demands the design aspect of the solution and not the code. It was open ended question.

Solution

//With setInterval, throttling and flags
setInterval=>Endpoint=>Render

//with the inversion of control
//Endpoint=>Render=>setTimeout=>Endpoint=>Render=>SetTimeout...

11) Convert class based inheritance code given below to ES5 code.

class Parent(name){
  constructor(name) {
    this.name=name
  }

  getName(){return this.name}
}

class Children extends Parent {
  constructor(props){
    super(props)
  }
}

Solution

function Parent(name) {
  this.name = name
}

Parent.prototype.getName = function() {
  return this.name
}

function Children(name){
  Parent.call(this, name)
}

Children.prototype = new Parent()

12) What does following code evaluates to?

//Q.1
var x = 1;
var y = x;

x = 0;
console.log(x, y);

//Q.2
var x = [1];
var y = x;

x = [];
console.log(x,y);

//Q.3
function Abc() { console.log(this); };
Abc()
new Abc();

//Q.4
var x = 1;
var obj = {
  x: 2,
  getX: function () {
    return console.log(this.x);
  }
};

obj.getX()
let a = obj.getX
console.log(a)

//Q.5
//How to get the a to log 2 in the above code

//Q.6
console.log("A");
setTimeout(() => console.log("B"), 0);
setTimeout(() => console.log("C"), 0);
console.log("D");

//Q.7
setTimeout(function() {
  console.log("A");
}, 0);
Promise.resolve().then(function() {
  console.log("B");
}).then(function() {
  console.log("C");
});

console.log("D");

//Q.8
let obj1 = {
  a:1,
  b:2
}

function mutate(obj) {
  obj = {a:4, c:6}
}

console.log(obj1)
mutate(obj1)
console.log(obj1)

Solution

//A.1
0 1

//A.2
[] [1]

//A.3
window object is logged

//A.4
logs 2 and 1

//A.5
a.call(obj);

//A.6
A, D, B , C

//A.7
D, B, C, A

//A.8
{ a: 1, b: 2 }
{ a: 1, b: 2 }

13) Given an array of numbers implement the following

const list = [1,2,3,4,5,6,7,8]
const filteredArray = list.filter(between(3, 6)) // [4,5]

Solution

function between(start, end) {
  return function (value,index) {
    return value>start && value<end
  }
}

Algorithms

1) Consider the following series:

A := 1
B := A*2 + 2
C := B*2 + 3 and so on...

Write a program that:

outputs the number corresponding to a given letter

given a string of letters like 'GREP', computes the sum of the numbers corresponding to all the letters in the string (i.e., G + R + E + P), as given by the above series and

given a large number (that would fit into a standard 32-bit integer), finds the shortest string of letters corresponding to it.

You may use a greedy approach for the last part. Compute the values of the numbers corresponding to letters as and when required and DO NOT pre-compute beforehand and store them in a data structure.

Solution

//A = 1
//B = A*2 +2 
//C = B*2+ 3
//D = C*2+ 3

var genCharArray = function(charA, charZ) {
    var a = [], i = charA.charCodeAt(0), j = charZ.charCodeAt(0);
    for (; i <= j; ++i) {
        a.push(String.fromCharCode(i));
    }
    return a;
}

var charMap = {};
var charArray = genCharArray('a', 'z');

charArray.forEach(function(char, index){
    charMap[char] = Number(index + 1);
});


var charSequence = function(char){
    if(typeof char==="string"){
        char = charMap[char];
    }
    if(char==1){
        return 1;
    }else{
        return char + 2 * charSequence(char-1);
    }
}

var input = process.argv[2];

if(input.length===1){
    console.log(charSequence(charMap[input]));
}else if(input.length>1){
    var charTotalSequence = input.split("").reduce(function(acc, curr){ 
        return acc + charSequence(charMap[curr]);
    },0);
    console.log(charTotalSequence);
}

2) Given an array find a pair such that it sums to a given number

Solution

let nums = [2, 7, 10, 1, 11, 15, 9]
let target = 11
let numsMap = new Map()
let pairs = nums.reduce((acc, num) => {
  let numToFind = target - num
  if (numsMap.get(numToFind)) {
    return [...acc, [num, numToFind]]
  } else {
    numsMap.set(num, true)
    return [...acc]
  }
}, [])

console.log("Pairs ", pairs)

3) Find the local maxima in a given array. A local maxima is a element that is greater than it's left and right neighbours. I provided a O(n) solution which was quite straight forward before going for optimisation.

Solution

let x = [1, 2, 3, 5, 4] //Outputs: 5
if x.length == 1 return x[0]
else 
 let i = 1
 for(;i<x.length-1;i++){
  if x[i-1]<x[i] and x[i] > x[i+1] return x[i]
 }
 if x.length - 1 == i return x[i]


4) Rotate a matrix clockwise by 90 degree. The solution should be in place.

leetcode

Solution

[
 [1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]
]
//The solution is to first take the transpose of the matrix.
//After taking the transpose the resulting matrix is as follows.
[
 [1, 4, 7],
 [2, 5, 8],
 [3, 6, 9]
]
//After the transpose step, All we have to do is to reverse the array @ each entry.
//The resulting matrix after after reversal is as follows.
[
 [7, 4, 1],
 [8, 5, 2],
 [9, 6, 3]
]
//The above matrix is rotated 90 degree

5) Maximum subarray sum modulo m

Solution


6) Given an array find three element in array that sum to a given target

Solution

let x = [1, 2, 3, 4, 5]
let target = 7
let found = []

const twoPointer = (l ,r, current) => {
  while(l<r){
    const totalSum = current + x[l] + x[r]
    if (totalSum === target) {
      found.push([current, x[l], x[r]])
      return
    } else if (totalSum > target) {
      r--
    } else {
      l++
    }
  }
}

const threeSum = (x, target) => {
    for (let i=0;i<x.length;i++) {
      const current = x[i];
      let leftPointer = i+1
      let rightPointer = x.length - 1

      if (current+x[leftPointer]+x[rightPointer] === target) {
        found.push([current, x[leftPointer], x[rightPointer]])
      } else {
        twoPointer(leftPointer, rightPointer, current)
      }
  }
  return found
}

7) Given a string and an integer k, find number of substrings in which all the different characters occurs exactly k times.

link

Solution

const subStrHasSameCharCount = (str, startIndex, endIndex, totalHop) => {
  let charMap = {}
  for (let k=startIndex;k<endIndex;k++) {
    let currentChar = str[k]
    if (charMap[currentChar]) {
      charMap[currentChar]++
    } else {
      charMap[currentChar] = 1
    }
  }
  let totalCount = Object.values(charMap).length > 0
  return totalCount ? Object.values(charMap).every(item => item == totalHop) : false
}


const characterWithCountK = (str, k) => {
  if (k == 0) return ''
  let count = 0
  let initialHop = k
  while (initialHop < str.length) {
    for (let j=0;j<str.length;j++) {
      let startIndex = j
      let endIndex = j + initialHop
      if(endIndex > str.length) continue
      count = subStrHasSameCharCount(str, startIndex, endIndex, k)
        ? count + 1: count
    }
    initialHop+=k
  }
  count = subStrHasSameCharCount(str, 0, initialHop, k)
        ? count + 1: count
  return count
}


let str = 'aabbcc'
let k = 2
console.log(characterWithCountK(str, k))

8) Given two input strings, s1 and s2, containing characters from a-z in different orders, find if rearranging string in s1 results in a string that is equal to s2.

Solution

let s1 = 'dadbcbc'
let s2 = 'ccbbdad'
let charMap = {}

const canBeRearranged = (s1, s2) => {
  if(s1.length!==s2.length){
    return false
  }
  for(let i=0;i<s1.length;i++){
    const charFromString1 = s1[i]
    const charFromString2 = s2[i]
    if(charFromString1 in charMap){
      charMap[charFromString1]++
    } else {
      charMap[charFromString1] = 1
    }
    if(charFromString2 in charMap){
      charMap[charFromString2]--
    } else {
      charMap[charFromString2] = -1
    }
  }
  for(let x in charMap){
    if (charMap[x]!==0){
      return false
    }
  }
  return true
}

canBeRearranged(s1, s2)

9) Given an array or variable input size, write a function to shuffle the array.

Solution

const swap = (index1, index2, arr) => {
  let temp = arr[index1]
  arr[index1] = arr[index2]
  arr[index2] = temp
}

const shuffle = (arr) => {
  let totalLength = arr.length
  while(totalLength > 0) {
    let random = Math.floor(Math.random() * totalLength)
    totalLength--
    swap(totalLength, random, arr)
  }
  return arr
}


let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
arr = shuffle(arr)

10) Calculate the sum of all elements in a multidimensional array of infinite depth.

Solution

let arr = [4, 5, 7, 8, [5, 7, 9, [3, 5, 7]]]
let sum = 0

const calculateSum = (arr) => {
  arr.reduce(function(acc, currentVal) {
    const isEntryArray = Array.isArray(currentVal)
    if (isEntryArray) {
      return acc.concat(calculateSum(currentVal))
    } else {
      sum+=currentVal
      return acc.concat(currentVal)
    }
  }, [])
}
calculateSum(arr)
console.log(sum)

11) Flatten a nested object of varying debt.

Solution

const obj = {
  level1: {
    level2: {
      level3: {
        more: 'stuff', 
        other: 'otherz',
        level4: {
          the: 'end',
        },
      },
    },
    level2still: {
      last: 'one',
    },
    am: 'bored',
  },
  more: 'what',
  ipsum: {
    lorem: 'latin',
  },
};

var removeNesting = function(obj, parent){
  for (let key in obj){
    if (typeof obj[key] === "object") {
      removeNesting(obj[key], parent+"."+key)
    } else {
      flattenedObj[parent+'.'+key] = obj[key]
    }
  }
}

let flattenedObj = {}
const sample = removeNesting(obj, "");
console.log(flattenedObj);

12) Given a json input, where each entry represents a directory such that each directory in turn can have a nested entry of it's own. Create the resulting directory structure.

Solution


13) Given an array of object containing list of employee data such that each employee has list of reportee. Use this information to construct a hierarachy of employees.

Solution

const employeesData = [{
  id: 2,
  name: 'Abhishek (CTO)',
  reportees: [6] 
}, {
  id: 3,
  name: 'Abhiram (COO)',
  reportees: []
}, {
  id: 6,
  name: 'Abhimanyu (Engineering Manager)',
  reportees: [9] 
}, {
  id: 9,
  name: 'Abhinav (Senior Engineer)',
  reportees: []
}, {
  id: 10,
  name: 'Abhijeet (CEO)',
  reportees: [2, 3],
}];

/*
A (CEO)
----B (CTO)
--------D (Engineering Manager)
------------E (Senior Software Engineer)
----C (COO)
*/

const findCeo = (currentEmp) => {
  let parentEmployee = employeesData.filter(emp => emp.reportees.indexOf(currentEmp.id) > -1)
  if (parentEmployee && parentEmployee.length > 0) {
    return findCeo(parentEmployee[0])
  } else {
    return currentEmp
  }
}

const logHierarchy = (currentEmp, indent) => {
  console.log("-".repeat(indent) + currentEmp.name)
  indent+=4;
  for(let i=0;i <currentEmp.reportees.length;i++) {
    let employee = employeesData.filter(emp => emp.id === currentEmp.reportees[i])
    logHierarchy(employee[0], indent)
  }
}

const traverse = (employee) => {
  let ceo = findCeo(employee)
  logHierarchy(ceo, 0)
}

traverse(employeesData[0])

14) Print a given matrix in spiral form

const inputMatrix = [
  [1, 2, 3, 4,  5],
  [6, 7, 8, 9, 10],
  [11,12,13,14,15],
  [16,17,18,19,20],
]

const exprectOutput = [1,2,3,4,5,10,15,20,19,18,17,16,11,6,7,8,9,14,13,12]

Solution

function spiralParser(inputMatrix){
  const output = [];
  let rows = inputMatrix.length;
  let cols = rows > 0 ? inputMatrix[0].length : 0;

  //singleEmptyRow => Edge case 1 //[]
  if (rows === 0) {
    return []
  }

  if (rows === 1) {
    //singleElementRowNoCol => Edge case 2 //[[]]
    if (cols === 0) {
      return []
    } else if (cols === 1){
      //singleElementRow => Edge case 3 //[[1]]
      output.push(inputMatrix[0][0])
      return output 
    }
  }

  let top = 0;
  let bottom = rows - 1;
  let left = 0;
  let right = cols - 1;
  let direction = 0;
  //0 => left->right
  //1 => top->bottom
  //2 => right->left
  //3 => bottom->top

  while(left <= right && top <= bottom) {
    if(direction === 0) {
      //left->right
      for (let i=left; i<=right;i++) {
        output.push(inputMatrix[top][i])
      }
      top++;
    } else if (direction === 1) {
      //top->bottom
      for (let i=top; i<=bottom;i++) {
        output.push(inputMatrix[i][right])
      }
      right--
    } else if (direction === 2) {
      //right->left
      for (let i=right; i>=left;i--) {
        output.push(inputMatrix[bottom][i])
      }
      bottom--
    } else if (direction === 3) {
      //bottom->top
      for (let i=bottom; i>=top;i--) {
        output.push(inputMatrix[i][left])
      }
      left++
    }
    direction = (direction + 1) % 4
  }
  return output;
}

console.log(spiralParser(inputMatrix2))

15) Find maximum consecutive repeating char in a give string.

let str = 'bbbaaaaccadd'; //max repeating char is a with count 4

Solution

//sudo code
maxNow = if input string length is 1 or greater than 1 ? 1 : 0
maxOverall = if input string length is 1 or greater than 1 ? 1 : 0

for char in inputString starting from index 1
  if char equals prevChar
    maxNow++
    maxOverall = max(maxOverall, maxNow)
  else if char not equals prevChar    
    maxNow = 1


16) Given a input array of varying length, segregate all the 2's at the end of the array.

let inputArr = [2,9,1,5,2,3,1,2,7,4,3,8,29,2,4,6,54,32,2,100]
//ouput => [9,1,5,3,1,7,4,3,8,29,4,6,54,32,100,2,2,2,2,2]

Solution

let slowRunner = 0

for (let fastRunner=0;fastRunner<arr.length;fastRunner++) {
  if (arr[fastRunner]!==2 && arr[slow] == 2) {
    [arr[fastRunner], arr[slow]] = [arr[slow], arr[fastRunner]]
    slowRunner++
  }
}

17) Reverse a linked list

//Input = 1 -> 2 -> 3 -> 4 -> 5 -> 6
//Output = 1 <- 2 <- 3 <- 4 <- 5 <- 6

Solution

//sudo code
let current = head
let prev = null
let next = null

while(current) {
  next = current.next
  current.next = prev
  prev = current
  current = next
}

18) preorder tree traversal using iteration (No recurssion)

Solution

//sudo code
const preorder = (root) => {
  let stack = []
  stack.push(root)

  while(there is element in stack) {
    let current = stack.pop()
    console.log(current.value)
    if (current.right) {
      stack.push(current.right)
    }
    if (current.left) {
      stack.push(current.left)
    }
  }
}

Assignments

1) Design a parking lot system with following requirements:

  • It can hold up to N vehicles. Handle availability of parking lot.
  • Entry and exit log of vehicles.
  • Automated ticketing system for every vehicle entering/exiting the parking lot will have vehicle registration with vehicle details like: Registration No., Color, allocated parking slot.

I should be able to query:

  • Registration No. of all vehicles of a particular color.
  • Parking slot of a vehicle given registration no.
  • Parking slots for vehicles given a color.
  • List of available slots in the parking lot.

Requirements:

  • Can use anything to structure the code: Classes/Structs.
  • Your solution should be extendable for future use cases.

Few code design principles:

  • Modularity of code.
  • Naming conventions.
  • SOLID principles.

Solution


2) Create a react component Ping that makes an API call to a given URL. If the API calls returns status code 200 that means the user is online. However, if the API call receives status code other than 200 it means, the user is offline.

Try changing status form dev tools network panel

Solution


3) Create a dynamic form builder from a json input. The form can be grouped based on id. Each group can have a nested group of it's own.

Solution


4) Create a minimal excel sheet in pure javascript that supports adding and removing rows, columns. There was time limit on this question of 40 minutes.

Solution


5) You have to make a search input box which will search over a list of users.

The user object has the following fields

   id: a unique id
   name: users name
   items: list of items ordered by user
   address: address of the user
   pincode: user address pin code

You have to implement search on all of the fields.

The search results will show up as a list of User Cards.

To Summarize
On typing in the search input box, the search results list opens up. The search could be just a string matching search.

The list of cards can be navigated through keyboard or mouse
only one card should highlight at a time if both mouse and keyboard are used for navigation

(keyboard will take preference if mouse is kept hovered on the list, similarly mouse will take preference if keyboard navigation is not used).

This behaviour is similar to how youtube search works

When no search results are found, an empty card is displayed
The card list would be scrollable.

The highlighted card (via keyboard/mouse) will scroll into view

Solution

Miscellaneous

1) How would you architect a front end application click
1) Implement Lazy loading click
2) What is Server Side Rendering.
3) How to deploy a react app to production.
4) What are service worker/web worker.
5) How to optimise a web app and make it more performant.
6) Explain different type of client side cache strategies.
7) What is CORS.
8) What are higher order component in react.
9) How does connect function work in redux.
10) What are pure components in React.

Resources

link

Posted on by:

devabhijeet profile

Abhijeet Yadav

@devabhijeet

A software enthusiast with a passion for learning and exploring new things.

Discussion

markdown guide
 

This list of problems to solve is extremely discouraging. I've done Hackerrank/leetcode/codesignal challenges, and most of these seem like things that would take me at least a couple hours. Mainly, I can't even see a 'first step' to a solution after reading the problem. But if you have all these exercises, it means you had all these interviews without being hired... and if they didn't hire you, then what gnats chance in hell do i have?

Congratulations, truly, for getting the interviews, and I thank you kindly for posting these in an attempt to help others learn from your experience.

 

Yeah, I know right. It's not like I had it all figured out. The solutions I have posted here are the final ones that I had reached after making countless mistake and a ton of console logs. The toughest amongst them were 1 and 7. On any other day I wouldn't be struggling that much but presenting solution during interview is a whole different ball game.

Also I had cleared a lot of interviews but most of it didn't materialize. Some of the interviews I gave were only to gain experience, even when I was not interested in the company I was getting interviewed at.

 

These interview questions aren't necessarily meant to be answered on the spot. They're purposely complex so that the interviewer can see your thought and team process.

I was dumbfounded by many interview questions and I'm currently in a few final rounds. One of them is a fortune 500 company, and that's the one I most shaky in and never wrote a full implementation. But by talking my way through it aloud, the interviewer realized that I knew what I was doing and needed more time.

Just make sure to collaborate with the interviewer as if you already work there. Ask questions and provide input as you search for the solution. Understand why you're making certain choices, and the tradeoffs of them. They want to know how you'll be on the job after all.

Any honest developer would agree that if you haven't seen these problems before, it would take more than a couple of hours.

Like, who seriously believes promises were implemented in a day, let alone a couple of hours? And for those who do think that, do you even want to work with that toxic mentality?

The path to the solution is more important than the solution. So focus less on interviewing, and more on acting the same as you would on the job.

 

Solid take and advice. Thanks.

 

I disagree. These questions are not that hard for someone calling themself a software engineer.

 

Very helpful. Congratulations on your new title.

A tad unnecessary. Just stating my opinion.

 

I disagree with your disagreement, this post has the tag react, which is a front-end web dev library, not a software engineering thing.

Never mind how little sense that makes, the author actually stated he was being interviewed for a Software Engineer position. How is the tag of the post relevant, given that fact.

 

Your promise implementation is incorrect.
This is how the promise works:
If the handler function:

  • returns a value, the promise returned by then gets resolved with the returned value as its value.
  • doesn't return anything, the promise returned by then gets resolved with an undefined value.
  • throws an error, the promise returned by then gets rejected with the thrown error as its value.
  • returns an already fulfilled promise, the promise returned by then gets fulfilled with that promise's value as its value.
  • returns an already rejected promise, the promise returned by then gets rejected with that promise's value as its value.
  • returns another pending promise object, the resolution/rejection of the promise returned by then will be subsequent to the resolution/rejection of the promise returned by the handler. Also, the resolved value of the promise returned by then will be the same as the resolved value of the promise returned by the handler.
 

The implementation is a rough idea.

 

I believe it's better to provide a correct solution or no solution at all, otherwise, it may mislead our fellow developers into believing it to be the correct solution. You may check out this link for a detailed implementation and explanation of promises. By the way great post. :)

Please read the note before the answer started.

Yes, I've read that, it says "not production ready", not that the provided solutions are psudo-code. Anyway great stuff 👍.

 

Hi, thank you for sharing this but can you explain your getHashCode implementation ?
I though you would compute some values, based on charCodeAt() and maybe bitwise operation or anything, to make it unique, but you simply returned the string instance.

 

I expected the same when the interviewer asked the question. However, on further follow up the interviewer asked me to only make a method by the same name available on the instance. Strange 😕

 

Oh ok weird, thank you.
great blogpost anyway :)

 

2) Create a promise from scratch

Sorry, but your promise implementation is wrong. then and catch must return new Promise instance but not this. That's why your sample doesn't work correct:

promise
  .then(function(response){
    console.log(response);
  return [...response];
  }).
then(response => {
  console.log(response);
})
  .catch(function(error){
    console.log(error)
  });

Compare results using original Promise.

 

lol. here i am a year into learning JS about an hour a day just mainly for fun. got more serious recently about trying for an entry level front end job and have been applying about 3 hours a day. but after seeing this im crushed... yay! thanks for sharing lol

 

What types of positions did you apply for? Entry-level? Junior? Mid? Senior level? Just curious!

 

It was Software Engineer III position.

 
 
 

All this stuff for Frontend post? I am a fresher starting career in Frontend Development. But I hate DSA from my bottom of the heart. What should I do? These types of questions will freak me out.

 

I am not sure if a fresher will be subjected to same questions. However, learning DSA will help you out in long term if you are considering Software development for profession. You can check my Resources for preparation blog. It has links to some youtube channel to get started with DSA.

 

is this type of stuff way beyond a junior front end web dev interview? i f****in hope so lol... i would NEVER be able to answer this

 

Why does 'two' > 'three' evaluate to true?

 

For this case, ASCII value of first character from both string are compared. Since the first char is 't' from both string, the resultant ASCII value will also be same. The evaluation then moves to the second character of both string.

Character 'w' from string one has ASCII value greater than ASCII value of character 'h' from string two, hence evaluation will now be of below state...

ASCII(w) > ASCII(h) => true

Also the below evaluates to false

'tWo' > 'three' //false
 
Sloan, the sloth mascot Comment marked as low quality/non-constructive by the community View code of conduct

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