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Javascript Articles
Page 382 of 534
Calculating excluded average - JavaScript
Suppose we have an array of objects like this −const arr = [ {val: 56, canUse: true}, {val: 16, canUse: true}, {val: 45, canUse: true}, {val: 76, canUse: false}, {val: 45, canUse: true}, {val: 23, canUse: false}, {val: 23, canUse: false}, {val: 87, canUse: true}, ];We are required to write a JavaScript function that calculates the average of the val property of all those objects that have a boolean true set for the canUse flag.ExampleFollowing is the code −const arr = [ {val: 56, canUse: true}, {val: 16, canUse: true}, ...
Read MoreFinding the rotation of an array in JavaScript
We are required to write a JavaScript function that takes in an array and a number n.Our function should rotate the array by n elements, i.e., take n elements from the front and put them to the end.The only condition here is that we have to do this without using any extra space in memory −For example −If the input array is the following, const arr = [12, 6, 43, 5, 7, 2, 5];and number n is 3, then the output should be;const output = [5, 7, 2, 5, 12, 6, 43];ExampleFollowing is the code −const arr = [12, 6, ...
Read MoreThrice sum of elements of array - JavaScript
We are required to write a JavaScript function that takes in an array of Numbers and returns a new array with elements as sum of three consecutive elements from the original array.For example, if the input array is −const arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]Then the output should be −const output = [3, 12, 21, 9];ExampleFollowing is the code −const arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] const thriceSum = arr => { if(!arr.length){ return []; } const res = []; for(let i = 0; i < arr.length; i += 3){ res.push(arr[i] + (arr[i+1] || 0) + (arr[i+2] || 0)); }; return res; }; console.log(thriceSum(arr));OutputThis will produce the following output in console −[ 3, 12, 21, 9 ]
Read MoreDoes this array contain any majority element - JavaScript
Given an array of Numbers, any element of the array will be a majority element if that element appears more than array length's 1/2 times in the array.For example −If the length of array is 7, Then if there's any element in the array that appears for at least 4 number of times, it will be considered a majority. And it’s quite apparent that any particular array can have at most one majority element.We are required to write a JavaScript function that takes in an array of numbers with repetitive values and returns true if there exists a majority element ...
Read MoreAre array of numbers equal - JavaScript
We are required to write a JavaScript function that takes in two arrays of Numbers, say first and second and checks for their equality.The arrays will be considered equal if −They contain the same elements and in the same order.The product of all the elements of the first array and second array is equal.The first array of numbers −const first = [3, 5, 6, 7, 7];The second array of numbers −const second = [7, 5, 3, 7, 6];ExampleFollowing is the code −const first = [3, 5, 6, 7, 7]; const second = [7, 5, 3, 7, 6]; const isEqual = ...
Read MoreCheck whether a string ends with some other string - JavaScript
We are required to write a JavaScript function that takes in two strings say, str1 and str2. The function should determine whether or not str1 ends with str2. Our function should return a boolean on this basis.Here’s our 1st string −const str1 = 'this is just an example';Here’s our 2nd string −const str2 = 'ample';ExampleFollowing is the code −const str1 = 'this is just an example'; const str2 = 'ample'; const endsWith = (str1, str2) => { const { length } = str2; const { length: l } = str1; const sub = str1.substr(l - length, length); ...
Read MoreFinding special type of numbers - JavaScript
In the decimal number system, all the real numbers can be divided into two groups −Rational NumbersIrrational NumbersFor the scope of this problem we will only discuss the rational numbers, All those numbers which can be written in the p/q (where q !== 0) form are called rational numbers.Like 14, 4.6, 3.33333... and many moreThe rational numbers, further can be divided into two groups −Terminating decimal numbersRepeating decimal numbersThis categorization is made on the basis of result obtained upon dividing p by q.The thumb for this categorization is that −We will obtain a terminating decimal number if and only if ...
Read MoreJavaScript: Finding nearest prime number greater or equal to sum of digits - JavaScript
We are required to write a JavaScript function that takes in a number, finds the sum of its digits and returns a prime number that is just greater than or equal to the sum.ExampleFollowing is the code −const num = 56563; const digitSum = (num, sum = 0) => { if(num){ return digitSum(Math.floor(num / 10), sum + (num % 10)); } return sum; }; const isPrime = n => { if (n===1){ return false; }else if(n === 2){ return true; }else{ for(let ...
Read MoreRetrieve user id from array of object - JavaScript
Suppose, we have an array of objects where the user names are mapped to some unique ids like this −const arr = [ {"4": "Rahul"}, {"7": "Vikram"}, {"6": "Rahul"}, {"3": "Aakash"}, {"5": "Vikram"} ];As apparent in the array, same names can have more than one ids but same ids can be used to map two different names.We are required to write a JavaScript function that takes in one such array as the first argument and a name string as the second argument. The function should return an array of all ids that were used to ...
Read MoreFind the shortest string in an array - JavaScript
We are required to write a JavaScript function that takes in an array of strings and returns the index of string that is shortest in length.We will simply use a for loop and persist the index of string which is shortest in length.ExampleFollowing is the code −const arr = ['this', 'can', 'be', 'some', 'random', 'sentence']; const findSmallest = arr => { const creds = arr.reduce((acc, val, index) => { let { ind, len } = acc; if(val.length < len){ len = val.length; ind = index; ...
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