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Javascript Articles
Page 249 of 534
Displaying likes on a post wherein array specifies the names of people that liked a particular post using JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of names (string). This array specifies the names of people that liked a particular post on some social networking site.If the count of likes are less than or equal to three our function should simply return all names saying these people liked the post but if the count is greater than three then our function should return first two names and remaining count.ExampleFollowing is the code − Live Democonst names = ['Ram', 'Manohar', 'Jay', 'Kumar', 'Vishal']; const displayLikes = (names) => { return [ ...
Read MoreFinding the greatest and smallest number in a space separated string of numbers using JavaScript
ProblemWe are required to write a JavaScript function that takes in a string that contains numbers separated by spaces.Our function should return a string that contains only the greatest and the smallest number separated by space.Inputconst str = '5 57 23 23 7 2 78 6';Outputconst output = '78 2';Because 78 is the greatest and 2 is the smallest.ExampleFollowing is the code − Live Democonst str = '5 57 23 23 7 2 78 6'; const pickGreatestAndSmallest = (str = '') => { const strArr = str.split(' '); let creds = strArr.reduce((acc, val) => { let { greatest, ...
Read MoreReturning lengthy words from a string using JavaScript
ProblemWe are required to write a JavaScript function that takes in a sentence of words and a number. The function should return an array of all words greater than the length specified by the number.Inputconst str = 'this is an example of a basic sentence'; const num = 4;Outputconst output = [ 'example', 'basic', 'sentence' ];Because these are the only three words with length greater than 4.ExampleFollowing is the code − Live Democonst str = 'this is an example of a basic sentence'; const num = 4; const findLengthy = (str = '', num = 1) => { const strArr ...
Read MoreNumbers obtained during checking divisibility by 7 using JavaScript
ProblemWe can check for a number to be divisible by 7 if it is of the form 10a + b and a - 2b is divisible by 7.We continue to do this until a number known to be divisible by 7 is obtained; we can stop when this number has at most 2 digits because we are supposed to know if a number of at most 2 digits is divisible by 7 or not.We are required to write a JavaScript function that takes in a number and return the number of such steps required to reduce the number to a ...
Read MoreCan all array elements mesh together in JavaScript?
ProblemTwo words can mesh together if the ending substring of the first is the starting substring of the second. For instance, robinhood and hoodie can mesh together.We are required to write a JavaScript function that takes in an array of strings. If all the words in the given array mesh together, then our function should return the meshed letters in a string, otherwise we should return an empty string.ExampleFollowing is the code − Live Democonst arr = ["allow", "lowering", "ringmaster", "terror"]; const meshArray = (arr = []) => { let res = ""; for(let i = 0; i < ...
Read MoreLargest index difference with an increasing value in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr. Our function should return the largest difference in indexes j - i such that arr[i] { const { length: len } = arr; let res = 0; for(let i = 0; i < len; i++){ for(let j = i + 1; j < len; j++){ if(arr[i] res){ res = j - i; }; }; }; return res; }; console.log(findLargestDifference(arr));OutputAnd the output in the console will be −3
Read MoreFinding the missing number between two arrays of literals in JavaScript
ProblemWe are required to write a JavaScript function that takes in two arrays arr1 and arr2.arr2 is a shuffled duplicate of arr1 with just one element missing.Our function should find and return that one element.ExampleFollowing is the code − Live Democonst arr1 = [6, 1, 3, 6, 8, 2]; const arr2 = [3, 6, 6, 1, 2]; const findMissing = (arr1 = [], arr2 = []) => { const obj = {}; for (let i = 0; i < arr1.length; i++) { if (obj[arr1[i]] === undefined) { obj[arr1[i]] = 1; ...
Read MoreAll ways of balancing n parenthesis in JavaScript
ProblemWe are required to write a JavaScript function that takes in a number n. Our function should return an array showing all the ways of balancing n parenthesis.For example, for n = 3, the output will be −["()()()","(())()","()(())","(()())","((()))"]ExampleFollowing is the code − Live Democonst res = []; const buildcombination = (left, right, str) => { if (left === 0 && right === 0) { res.push(str); } if (left > 0) { buildcombination(left-1, right+1, str+"("); } if (right > 0) { buildcombination(left, right-1, str+")"); } } buildcombination(3, 0, ""); console.log(res);OutputFollowing is the console output −[ '((()))', '(()())', '(())()', '()(())', '()()()' ]
Read MoreMoving all zeroes present in the array to the end in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of literals that might contain some 0s. Our function should tweak the array such that all the zeroes are pushed to the end and all non-zero elements hold their relative positions.ExampleFollowing is the code − Live Democonst arr = [5, 0, 1, 0, -3, 0, 4, 6]; const moveAllZero = (arr = []) => { const res = []; let currIndex = 0; for(let i = 0; i < arr.length; i++){ const el = arr[i]; if(el === 0){ res.push(0); }else{ res.splice(currIndex, undefined, el); currIndex++; }; }; return res; }; console.log(moveAllZero(arr));OutputFollowing is the console output −[ 5, 1, -3, 4, 6, 0, 0, 0 ]
Read MoreDetermining sum of array as even or odd in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of integers arr. Our function should return the string ‘odd’ if the sum of all the elements of the array is odd or ‘even’ if it’s even.ExampleFollowing is the code − Live Democonst arr = [5, 1, 8, 4, 6, 9]; const assignSum = (arr = []) => { const sum = arr.reduce((acc, val) => { return acc + val; }, 0); const isSumEven = sum % 2 === 0; return isSumEven ? 'even' : 'odd'; }; console.log(assignSum(arr));OutputFollowing is the console output −odd
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