We are required to write a function that, given a number, say, 123, will output an array −[100, 20, 3]Basically, the function is expected to return an array that contains the place value of all the digits present in the number taken as an argument by the function.We can solve this problem by using a recursive approach.Therefore, let’s write the code for this function −ExampleThe code for this will be −const num = 123; const placeValue = (num, res = [], factor = 1) => {    if(num){       const val = (num % 10) * factor;   ... Read More

Suppose, we have an array of arrays of numbers like this −const arr = [[1, 45], [1, 34], [1, 49], [2, 34], [4, 78], [2, 67], [4, 65]];Each subarray is bound to contain strictly two elements. We are required to write a function that constructs a new array where all second elements of the subarrays that have similar first value are grouped together.So, for the array above, the output should look like −const output = [    [45, 34, 49],    [34, 67],    [78, 65] ];We can make use of the Array.prototype.reduce() method that takes help of a Map() ... Read More

We are required to write a JavaScript function that creates a multi-dimensional array based on some inputs.It should take in three elements, namely −row - the number of subarrays to be present in the array, col - the number of elements in each subarray, val - the val of each element in the subarrays, For example, if the three inputs are 2, 3, 10Then the output should be −const output = [[10, 10, 10], [10, 10, 10]];Therefore, let’s write the code for this function −ExampleThe code for this will be −const row = 2; const col = 3; const val ... Read More

In this article, the given task is to check the equality of array elements (sequence dependent). Before we proceed into examples, let’s look at how the input-output scenario will look when we are checking the equality of array elements (sequence dependent) in JavaScript. Input-Output scenario Let’s look into the input-output scenario, where we have declared two arrays and we need to get similar elements in sequence-dependent. Array1 = [2, 5, 6, 7, 9, 0]; Array2 = [3, 5, 0, 8, 9, 4]; Output = [5, 9] In the above snippet, we can see that there are two arrays ... Read More

We have a special kind of string that contains characters in couple, like this −const str = "AABBCCDDEE";We are required to construct an object based on this string which should look like this −const obj = {    code: "AA",    sub: {       code: "BB",       sub: {          code: "CC",          sub: {             code: "DD",             sub: {                code: "EE",                sub: {}   ... Read More

In this article, we are going to learn how to filter an array based on another array in JavaScript. An Array in JavaScript is used to store different elements. These elements are stored at contiguous memory locations. By using index numbers, we can access any or each data element present in the array. Index numbers will start form 0. Syntax Following is the syntax of the array in JavaScript – const array_name = [item1, item2, ...]; The following is the simple declaration of array in JavaScript, Const colors = ['Blue', 'Limegreen', 'Orange', 'Black']; Let’s assume some simple ... Read More

We have to write a function that takes in an array, removes all duplicates from it and inserts the same number of empty strings at the end.For example:If we find 4 duplicate values we have to remove then all and insert four empty strings at the end.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [1, 2, 3, 1, 2, 3, 2, 2, 3, 4, 5, 5, 12, 1, 23, 4, 1]; const deleteAndInsert = arr => {    const creds = arr.reduce((acc, val, ind, array) => {       let ... Read More

We have to write a simple function in JavaScript that takes in an array of Numbers (nested to any level) and return the greatest number present in the array.For example:If the input array is −const arr = [    34, 65, 67,    [       43, 76, 87, 23, 56, 7,       [          54, 7, 87, 23, 79, 994, 2       ],       54    ], 54, 4, 2 ];Then the output should be −994We will use recursion to find the greatest number in the array, Therefore, let’s ... Read More

Given a multidimensional array and the task is to pick the largest elements from it in JavaScript. The multidimensional arrays are an arrays inside an array. whenever there are arrays inside the array it will work as multidimensional array. Following is the one-dimensional array - const arr = ["Welcome", "to", "tutorials", "point"]; const arr = [1, 5, 12, 67, 99]; This is how the multidimensional array look like - const array=[["Mike tyson", "Vijay"], ["ananya", "charmee"], ["Lion", "Tiger"]]; This is how we can access the elements from multidimensional array - const array = [["Mike tyson", "Vijay"], ["ananya", ... Read More

We have an array of numbers and are required to write a function that returns an array with the average of the corresponding element and its predecessor.For the first element, as there are no predecessors, so that very element should be returned.Let’s write the code for this function, we will use the Array.prototype.map() function to solve this problem.ExampleThe code for this will be −const arr = [3, 5, 7, 8, 3, 5, 7, 4, 2, 8, 4, 2, 1]; const consecutiveAverage = arr => {    return arr.map((el, ind, array) => {       const first = (array[ind-1] || ... Read More