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Web Development Articles
Page 40 of 801
Finding two prime numbers with a specific number gap in JavaScript
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 −const gap = 4; const range = [20, 200]; const primesInRange = (gap, [left, right]) => { const isPrime = num => { for(let i = 2; i < num; i++){ if(num % i === 0){ ...
Read MoreRemoving n characters from a string in alphabetical order in JavaScript
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 −const 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 MoreFinding value of a sequence for numbers in JavaScript
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 −const n = 12; const p = 70; const findSeqSum = (n, p) => { let sum = 0; for(let k = 0; k
Read MoreCreate palindrome by changing each character to neighboring character in JavaScript
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 −const str = 'adfa'; const canFormPalindrome = (str = '') => { const middle = str.length / 2; for(let i = 0; i < middle; ...
Read MoreConstructing full name from first name, last name and optional middle name in JavaScript
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 −const 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
Read MoreFinding the height based on width and screen size ratio (width:height) in JavaScript
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 −const 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
Read MoreRealtime moving average of an array of numbers in JavaScript
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 −const arr = [1, 2, 3, 4, 5]; const movingAverage = (arr = []) => { const res = ...
Read MoreReducing array elements to all odds in JavaScript
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 −const 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 ]
Read MoreAll right triangles with specified perimeter in JavaScript
ProblemWe are required to write a JavaScript function that takes in a number that specifies the perimeter for a triangle. Our function should return an array of all the triangle side triplets whose perimeter is same as specified by the input.ExampleFollowing is the code −const perimeter = 120; const findAllRight = (perimeter = 1) => { const res = []; for(let a = 1; a
Read MoreReturn the nearest greater integer of the decimal number it is being called on in JavaScript
ProblemWe are required to write a JavaScript function that lives in the Math class of JavaScript.Our function should return the nearest greater integer of the decimal number it is being called on.If the number is already an integer, we should return it as it is.ExampleFollowing is the code −const num = 234.56; Math.ceil = function(num){ if(typeof num !== 'number'){ return NaN; }; if(num % 1 === 0){ return num; }; const [main] = String(num).split('.'); return +main + 1; }; console.log(Math.ceil(num));OutputFollowing is the console output −235
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