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Confusing Numbers:A number in an array is confusing if it becomes another number which is also present in the array after we rotate the number by 180 degrees vertically and horizontally. For instance, if we rotate 6 by 180 degrees vertically and horizontally it becomes 9 and vice-versa.We have to keep in mind that only rotations of 0, 1, 6, 8, 9 yield a valid number.We are required to write a JavaScript function that takes in a natural number, num, as the first and the only argument. The function should first construct an array of all natural numbers upto num, ... Read More
We are required to write a JavaScript function that takes in an array of numbers as the first and the only argument. The function should first pick the smallest number from the array and then calculate the sum of all the digits of the number.If the digit sum of that number is even, we should return true, false otherwise.For example −If the input array is −const arr = [12, 657, 23, 56, 34, 678, 42];Then the output should beconst output = false;because the smallest number in the array is 12 and its digit sum is 1 + 2 = 3, ... Read More
In the number system, the Greatest Common Divisor (GCD) of two numbers is that greatest number which divides both the numbers. Similarly, if we apply this concept to strings, the gcd of two strings is the greatest substring (greatest in length) that is present in both the strings.For example −If the two strings are −const str1 = 'abcabc'; const str2 = 'abc';Then the gcd of these strings will be −const gcd = 'abc';We are required to write a JavaScript function that takes in two strings str1 and str2 and computes and returns their gcd.ExampleThe code for this will be − Live ... Read More
Word Square:A word square consists of a set of words written out in a square grid, such that the same words can be read both horizontally and vertically.For instance, once valid word square is −H E A R T E M B E R A B U S E R E S I N T R E N DWe are required to write a JavaScript function that takes in an array of words. The function should return true if the array given as input forms a valid word square, false otherwise.For example −If the input word array is −const arr ... Read More
Suppose we are given an array of sorted characters letters containing only lowercase letters. And given a target letter target.We are required to write a JavaScript function that takes in the array as the first argument and the letter as the second. The function is supposed to find the smallest element in the list that is larger than the given target.We have to keep in mind that letters also wrap around. For example, if the target is target = 'z' and letters = ['a', 'b'], the answer is 'a'.For Example −If the input array and letter are −const arr = ... Read More
Palindrome Sequence:A string sequence is known as palindrome sequence if it reads the same from front and the back. For instance, 'aba', 'madam, 'did' are all valid palindrome sequences.We are required to write a JavaScript function that takes in a string as the first and the only argument. The string taken as input is guaranteed to consist of only 'a', 'b', 'c' and 'd'. Our function should count and return the number of all contiguous or noncontiguous palindrome subsequences that appear in the string.For example −If the input string is −const str = 'bccb';Then the output should be −const output ... Read More
We are required to write a JavaScript function that takes in an array of numbers, arr, as the first argument and a number, num, as the second argument.The function should determine whether there exists a way of distributing the elements of the array arr into num groups such that all the groups have equal sum. If there exists any such way, our function should return true, false otherwise.For example −If the input array and the number are −const arr = [4, 6, 3, 3, 7, 4, 1]; const num = 4;Then the output should be −const output = true;because the ... Read More
For the purpose of this question, we define a sentence as a string that contains English alphabets and punctuations and a word is a substring of that sentence joined together by whitespaces.We are required to write a JavaScript function that takes in a sentence string, str, as the first argument and a number, num, as the second argument. The function should first count the frequency of each word in the sentence and then return an array of length num containing num most frequent words placed according to decreasing frequencies.For example −If the input sentence and the number is −const str ... Read More
We are required to write a JavaScript function that takes in an array of string words as the first argument. The second argument to the function will be a string containing all 26 English lowercase alphabets but in some random scrambled order.The task of our function is to check whether the words in the array are placed lexicographically correctly according to the order specified by the second argument. If it is so, we should return true, false otherwise.For example −If the input array of words and the order is −const arr = ['this', 'is', 'something', 'mad']; const order = 'hdetljnopqabcuvwxfgirsykmz';Then ... Read More
We are required to write a JavaScript function that takes in a number as the first and the only argument. The function should then square every digit of the number, append them and yield the new number.For example −If the input number is −const num = 12349;Then the output should be −const output = 1491681;because '1' + '4' + '9' + '16' + '81' = 1491681ExampleThe code for this will be − Live Democonst num = 12349; const squareEvery = (num = 1) => { let res = '' const numStr = String(num); const numArr = numStr.split(''); ... Read More