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ProblemWe are required to write a JavaScript function that takes in an array. Our function should change the array numbers like this −If the number is odd, leave it changed.If the number is even, subtract 1 from it.And we should return the new array.ExampleFollowing is the code − Live Democonst arr = [5, 23, 6, 3, 66, 12, 8]; const reduceToOdd = (arr = []) => { const res = []; for(let i = 0; i < arr.length; i++){ const el = arr[i]; if(el % 2 === 1){ res.push(el); }else{ res.push(el - 1); }; }; return res; }; console.log(reduceToOdd(arr));OutputFollowing is the console output −[ 5, 23, 5, 3, 65, 11, 7 ]
ProblemWe are required to write a JavaScript function that takes in a string str. Our function should validate the alphabets in the string based on the numbers before them.We need to split the string by the numbers, and then compare the numbers with the number of characters in the following substring. If they all match, the string is valid and we should return true, false otherwise.For example −5hello4from2meshould return trueBecause when split by numbers, the string becomes ‘hello’, ‘from’, ‘me’ and all these strings are of same length as the number before themExampleFollowing is the code − Live Democonst str = ... Read More
ProblemWe are required to write a JavaScript function that takes in an array. Our function should construct a new array that stores the moving average of the elements of the input array. For instance −[1, 2, 3, 4, 5] → [1, 1.5, 3, 5, 7.5]First element is the average of the first element, the second element is the average of the first 2 elements, the third is the average of the first 3 elements and so on.ExampleFollowing is the code − Live Democonst arr = [1, 2, 3, 4, 5]; const movingAverage = (arr = []) => { const res ... Read More
ProblemWe are required to write a JavaScript function that takes in the width of the screen as the first argument and the aspect ratio (w:h) as the second argument. Based on these two inputs our function should return the height of the screen.ExampleFollowing is the code − Live Democonst ratio = '18:11'; const width = 2417; const findHeight = (ratio = '', width = 1) => { const [w, h] = ratio .split(':') .map(Number); const height = (width * h) / w; return Math.round(height); }; console.log(findHeight(ratio, width));OutputFollowing is the console output −1477
ProblemWe are required to write a JavaScript function that takes in three strings, first string specifies the first name, second string specifies the last name and the third optional string specifies the middle name.Our function should return the full name based on these inputs.ExampleFollowing is the code − Live Democonst firstName = 'Vijay'; const lastName = 'Raj'; const constructName = (firstName, lastName, middleName) => { if(!middleName){ middleName = ''; }; let nameArray = [firstName, middleName, lastName]; nameArray = nameArray.filter(Boolean); return nameArray.join(' '); }; console.log(constructName(firstName, lastName));OutputFollowing is the console output −Vijay Raj
ProblemWe are required to write a JavaScript function that takes in a string. Our function can do the following operations on the string −each character MUST be changed either to the one before or the one after in the alphabet."a" can only be changed to "b" and "z" to "y".Our function should return True if at least one of the outcomes of these operations is a palindrome or False otherwise.ExampleFollowing is the code − Live Democonst str = 'adfa'; const canFormPalindrome = (str = '') => { const middle = str.length / 2; for(let i = 0; i < ... Read More
ProblemConsider the following sequence sum −$$seq(n,\:p)=\displaystyle\sum\limits_{k=0} \square(-1)^{k}\times\:p\:\times 4^{n-k}\:\times(\frac{2n-k}{k})$$We are required to write a JavaScript function that takes in the numbers n and p returns the value of seq(n, p).ExampleFollowing is the code − Live Democonst n = 12; const p = 70; const findSeqSum = (n, p) => { let sum = 0; for(let k = 0; k
ProblemWe are required to write a JavaScript function that takes in a English alphabet string. Our function should return the top three most frequent words present in the string.ExampleFollowing is the code − Live Democonst str = 'Python was developed by Guido van Rossum in the late eighties and early nineties at the National Research Institute for Mathematics and Computer Science in the Netherlands. Python is derived from many other languages, including ABC, Modula-3, C, C++, Algol-68, SmallTalk, and Unix shell and other scripting languages. Python is copyrighted. Python source code is now available under the GNU General Public License (GPL)'; ... Read More
ProblemWe are required to write a JavaScript function that takes in a lowercase alphabet string and number num.Our function should remove num characters from the array in alphabetical order. It means we should first remove ‘a’ if they exist then ‘b’ , ‘c’ and so on until we hit the desired num.ExampleFollowing is the code − Live Democonst str = 'abascus'; const num = 4; const removeAlphabetically = (str = '', num = '') => { const legend = "abcdefghijklmnopqrstuvwxyz"; for(let i = 0; i < legend.length; i+=1){ while(str.includes(legend[i]) && num > 0){ ... Read More
ProblemWe are required to write a JavaScript function that takes in a number, gap as the first argument and a range array of two numbers as the second argument. Our function should return an array of all such prime pairs that have an absolute difference of gap and falls between the specified range.ExampleFollowing is the code − Live Democonst gap = 4; const range = [20, 200]; const primesInRange = (gap, [left, right]) => { const isPrime = num => { for(let i = 2; i < num; i++){ if(num % i === ... Read More