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Javascript Articles
Page 346 of 534
Adjacent elements of array whose sum is closest to 0 - JavaScript
We are required to write a JavaScript function that takes in an array of numbers and returns a subarray of two elements from the original array whose sum is closest to 0.If the length of the array is less than 2, we should return the whole array.For example: If the input array is −const arr = [4, 4, 12, 3, 3, 1, 5, -4, 2, 2];Here, the sum of pair [5, -4] is 1 which is closest 0 for any two adjacent elements of the array, so we should return [5, -4]ExampleFollowing is the code −const arr = [4, 4, ...
Read MoreLeft right subarray sum product - JavaScript
We are required to write a JavaScript function that takes in an array of numbers of length N (N should be even) and divides the array into two sub-array (left and right) containing N/2 elements each and do the sum of the subarrays and then multiply both the subarrays.For example: If the input array is −const arr = [1, 2, 3, 4]Then the output should be −(2+1) * (3+4) = 21ExampleFollowing is the code −const arr = [1, 2, 3, 4] const subArrayProduct = arr => { const { length: l } = arr; const creds = arr.reduce((acc, ...
Read MoreSum of distinct elements of an array - JavaScript
We are required to write a JavaScript function that takes in one such array and counts the sum of all distinct elements of the array.For example: Suppose, we have an array of numbers like this −const arr = [1, 5, 2, 1, 2, 3, 4, 5, 7, 8, 7, 1];The output for the array mentioned above will be 20.ExampleFollowing is the code −const arr = [1, 5, 2, 1, 2, 3, 4, 5, 7, 8, 7, 1]; const distinctSum = arr => { let res = 0; for(let i = 0; i < arr.length; i++){ if(i === arr.lastIndexOf(arr[i])){ res += arr[i]; }; continue; }; return res; }; console.log(distinctSum(arr));OutputFollowing is the output in the console −30
Read MoreFind the element that appears once in sorted array - JavaScript
Suppose, we have a sorted array of literals like this −const arr = [2, 2, 3, 3, 3, 5, 5, 6, 7, 8, 9];We are required to write a JavaScript function that takes in one such array and returns the first number that appears only once in the array. If there is no such number in the array, we should return false.For this array, the output should be 6ExampleFollowing is the code −const arr = [2, 2, 3, 3, 3, 5, 5, 6, 7, 8, 9]; const firstNonDuplicate = arr => { let appeared = false; for(let i ...
Read MoreCheck three consecutive numbers - JavaScript
We are required to write a JavaScript function that takes in a Number, say n, and we are required to check whether there exist such three consecutive natural numbers (not decimal/floating point) whose sum equals to n.If there exist such numbers, our function should return them, otherwise it should return false. Following is the code −Exampleconst sum = 54; const threeConsecutiveSum = sum => { if(sum < 6 || sum % 3 !== 0){ return false; } // three numbers will be of the form: // x + x + 1 + x ...
Read MoreCorner digit number difference - JavaScript
We are required to write a JavaScript function that takes in a number, constructs a new number from the first and last digit of that number and returns the difference between the original number and the number thus formed.For example: If the input is 34567Then the corner digits number will be −37And the output will be −34530ExampleFollowing is the code −const num = 34567; const cornerDifference = num => { let temp = Math.abs(num); let corner = temp % 10; if(temp < 100){ corner = temp; }else{ while(temp >= 10){ ...
Read MoreDiagonal product of a matrix - JavaScript
Suppose, we have a 2-D array representing a square matrix like this −const arr = [ [1, 3, 4, 2], [4, 5, 3, 5], [5, 2, 6, 4], [8, 2, 9, 3] ];We are required to write a function that takes in this array and returns the product of the element present at the principal Diagonal of the matrix.For this array the elements present at the principal diagonal are −1, 5, 6, 3Hence the output should be −90ExampleFollowing is the code −const arr = [ [1, 3, 4, 2], [4, 5, 3, 5], ...
Read MoreTwice repetitive word count in a string - JavaScript
We are required to write a JavaScript function that takes in a string that contains some words that are repeated twice, we need to count such words.For example −If the input string is −const str = "car bus jeep car jeep bus motorbike truck";Then the output should be −3ExampleFollowing is the code −const str = "car bus jeep car jeep bus motorbike truck"; const countRepetitive = str => { const strArr = str.split(" "); let count = 0; for(let i = 0; i < strArr.length; i++){ if(i === strArr.lastIndexOf(strArr[i])){ continue; ...
Read MoreChange string based on a condition - JavaScript
We are required to write a JavaScript function that takes in a string. The task of our function is to change the string according to the following condition −If the first letter in the string is a capital letter then we should change the full string to capital letters.Otherwise, we should change the full string to small letters.ExampleFollowing is the code −const str1 = "This is a normal string"; const str2 = "thisIsACamelCasedString"; const changeStringCase = str => { let newStr = ''; const isUpperCase = str[0].charCodeAt(0) >= 65 && str[0].charCodeAt(0)
Read MoreJavaScript - Check if array is sorted (irrespective of the order of sorting)
We are required to write a JavaScript function that takes in an array of literals and checks if the array is sorted or not (irrespective of the order of sorting.)Our function should return true if the array is sorted, false otherwise. Following is the code −Exampleconst arr = [1, 3, 56, 87, 99, 102, 144, 255, 456, 788, 999]; const isSorted = arr => { const { length: l } = arr; if(l 0 && arr[i-1] < 0; const con2 = arr[i] < 0 && arr[i-1] > 0; if(con1 || con2){ return false; }; }; return true; }; console.log(isSorted(arr)); OutputFollowing is the output in the console −true
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