If we look closely at the problem statement, the difference between ([] == false) and ([] || true) is the following −In the first case, we are using loose conditional checking, allowing type coercion to take over.While in the second case, we are evaluating [] to its respective Boolean (truthy or falsy) which makes use of the function Boolean() instead of type coercion under the hook.Let's now unveil the conversions that happens behind the scenes in both cases.Case 1 − ([] == false)According to the MDN docs if two data types say x and y are compared using the loose ... Read More

We are required to sort a dynamic JavaScript array. The condition is that we are required to sort it according to the values stored in a particular order in a standard predefined array.Let’s say the following is our dynamic array −const dbArray = ['Apple', 'Banana', 'Mango', 'Apple', 'Mango', 'Mango', 'Apple'];And suppose the standard array against which we have to sort the above array is like −const stdArray = ['Mango', 'Apple', 'Banana', 'Grapes'];So, after sorting the dbArray, my resultant array should look like −const resultArray = ['Mango', 'Mango', 'Mango', 'Apple', 'Apple', 'Apple', 'Banana'];ExampleFollowing is the code −const dbArray = ['Apple', 'Banana', ... Read More

We are required to write a JavaScript function that takes in a string as first argument and two single element strings. The function should return the distance between those single letter stings in the string taken as first argument.For example −If the three strings are −const str = 'Disaster management'; const a = 'i', b = 't';Then the output should be 4 because the distance between 'i' and 't' is 4ExampleFollowing is the code −const str = 'Disaster management'; const a = 'i', b = 't'; const distanceBetween = (str, a, b) => {    const aIndex = str.indexOf(a);   ... Read More

We are required to write a JavaScript function that takes in two strings that may / may not contain some common elements. The function should return an empty string if no common element exists otherwise a string containing all common elements between two strings.Following are our two strings −const str1 = 'Hey There!!, how are you'; const str2 = 'Can this be a special string';ExampleFollowing is the code −const str1 = 'Hey There!!, how are you'; const str2 = 'Can this be a special string'; const commonString = (str1, str2) => {    let res = '';    for(let i ... Read More

In JavaScript, we can write our own custom functions and assign them to the existing standard data types (it is quite similar to writing library methods but in this case the data types are primitive and not user defined. We are required to write a JavaScript String function by the name, let’s say swapCase().This function will return a new string with all uppercase characters swapped for lower case characters, and vice versa. Any non-alphabetic characters should be kept as they are.ExampleFollowing is the code −const str = 'ThIS iS A CraZY StRInG'; String.prototype.swapCase = function(){    let res = ''; ... Read More

Given a string, we are required to write a function that creates an object that stores the indexes of each letter in an array. The letters (elements) of the string must be the keys of objectThe indexes should be stored in an array and those arrays are values.For example −If the input string is −const str = 'cannot';Then the output should be −const output = {    'c': [0],    'a': [1],    'n': [2, 3],    'o': [4],    't': [5] };ExampleFollowing is the code −const str = 'cannot'; const mapString = str => {    const map = ... Read More

   The “full house in poker” is a situation when a player, out of their five cards, has at least three cards identical. We are required to write a JavaScript function that takes in an array of five elements representing a card each and returns true if there's a full house situation, false otherwise.ExampleFollowing is the code −const arr2 = ['K', '2', 'K', 'A', 'J']; const isFullHouse = arr => {    const copy = arr.slice();    for(let i = 0; i < arr.length; ){       const el = copy.splice(i, 1)[0];       if(copy.includes(el)){       ... Read More

We are required to write a JavaScript function that takes in a string of strings joined by whitespaces. The function should calculate and return the average length of all the words present in the string rounded to two decimal placesExampleFollowing is the code −const str = 'This sentence will be used to calculate average word length'; const averageWordLength = str => {    if(!str.includes(' ')){       return str.length;    };    const { length: strLen } = str;    const { length: numWords } = str.split(' ');    const average = (strLen - numWords + 1) / numWords; ... Read More

Lunar SumThe concept of lunar sum says that the sum of two numbers is calculated, instead of adding the corresponding digits, but taking the bigger of the corresponding digits.For example −Let’s say, a = 879 and b = 768(for the scope of this problem, consider only the number with equal digits)Then the lunar sum of a and b will be −879We are required to write a JavaScript function that takes in two numbers and returns their lunar sum.ExampleFollowing is the code −const num1 = 6565; const num2 = 7385; const lunarSum = (num1, num2) => {    const numStr1 = ... Read More

We are required to write a function that returns true if we can partition an array into one element and the rest, such that this one element is equal to the product of all other elements excluding itself, false otherwise.For example: If the array is −const arr = [1, 56, 2, 4, 7];Then the output should be trueBecause, 56 is equal to −2 * 4 * 7 * 1ExampleFollowing is the code −const arr = [1, 56, 2, 4, 7]; const isEqualPartition = arr => {    const creds = arr.reduce((acc, val) => {       let { prod, ... Read More