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Articles on Trending Technologies
Technical articles with clear explanations and examples
Swap certain element from end and start of array - JavaScript
We are required to write a JavaScript function that accepts an array of Numbers and a number, say n (n must be less than or equal to the length of array). And our function should replace the kth element from the beginning with the nth element from the end of the array.ExampleFollowing is the code −const arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; const swapNth = (arr, k) => { const { length: l } = arr; let temp; const ind = k-1; temp = arr[ind]; arr[ind] = arr[l-k]; arr[l-k] = temp; }; swapKth(arr, 4); console.log(arr); swapNth(arr, 8); console.log(arr);OutputThis will produce the following output in console −[ 0, 1, 2, 6, 4, 5, 3, 7, 8, 9 ] [ 0, 1, 7, 6, 4, 5, 3, 2, 8, 9 ]
Read MoreSplitting string into groups – JavaScript
Given a string S, consisting of alphabets, numbers and special characters. We need to write a program to split the strings in three different strings S1, S2 and S3, such that −The string S1 will contain all the alphabets present in S, The string S2 will contain all the numbers present in S, andS3 will contain all special characters present in S.The strings S1, S2 and S3 should have characters in the same order as they appear in input.ExampleFollowing is the code −const str = "Th!s String C0nt@1ns d1fferent ch@ract5rs"; const seperateCharacters = str => { const strArr = ...
Read MoreSplit keys and values into separate objects - JavaScript
Suppose, we have an object like this −const dataset = { "diamonds":77, "gold-bars":28, "exciting-stuff":52, "oil":51, "sports-cars":7, "bitcoins":40 };We are required to write a JavaScript function that takes one such object and returns an array of objects that have keys and their values splitted.Therefore, for the above object, the output should be −const output = [ {"asset":"diamonds", "quantity":77}, {"asset":"gold-bars", "quantity":28}, {"asset":"exciting-stuff", "quantity":52}, {"asset":"oil", "quantity":51}, {"asset":"bitcoins", "quantity":40} ];ExampleFollowing is the code −const dataset = { "diamonds":77, "gold-bars":28, "exciting-stuff":52, "oil":51, "sports-cars":7, "bitcoins":40 }; const splitKeyValue = ...
Read MoreDeleting the duplicate strings based on the ending characters - JavaScript
We are required to write a JavaScript function that takes in an array of strings and deletes each one of the two strings that ends with the same character −For example, If the actual array is −const arr = ['Radar', 'Cat' , 'Dog', 'Car', 'Hat'];Then we have to delete one and keep only one string ending with the same character in the array of distinct letters.ExampleFollowing is the code −const arr = ['Radar', 'Cat' , 'Dog', 'Car', 'Hat']; const delelteSameLetterWord = arr => { const map = new Map(); for(let i = 0; i < arr.length; ){ ...
Read MoreCalculating 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); ...
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