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We are required to write a JavaScript function that takes in an array of sorted integers and a target average as first and second arguments.The function should determine whether there is a pair of values in the array where the average of the pair equals to the target average.There's a solution with O(1) additional space complexity and O(n) time complexity. Since an array is sorted, it makes sense to have two indices: one going from begin to end (say y), another from end to begin of an array (say x).ExampleThe code for this will be −const arr = [1, 2, ... Read More
Suppose, we have an array of arrays like this −const arr = [[12345, "product", "10"], [12345, "product", "15"], [1234567, "other", "10"]];We are supposed to write a function that takes in one such array. Notice that all the subarrays have precisely three elements in them.Our function should filter out that subarray which has a repeating value as its first element. Moreover, for the subarray, we remove we should add their third element to its existing nonrepeating counterpart.So, for the above array, the output should look like −const output = [[12345, "product", "25"], [1234567, "other", "10"]];ExampleThe code for this will be −const ... Read More
Consider the following backtracing problem: On a 2−dimensional grid, there are 4 types of squares −1 represents the starting square. There is exactly one starting square.2 represents the ending square. There is exactly one ending square.0 represents empty squares we can walk over.−1 represents obstacles that we cannot walk over.We are required to write a function that returns the number of 4−directional walks from the starting square to the ending square, that walk over every non−obstacle square exactly once.Exampleconst arr = [ [1, 0, 0, 0], [0, 0, 0, 0], [0, 0, 2, -1] ]; const uniquePaths ... Read More
We are required to write a function that does the following −takes an array of integers as an argument (e.g. [1, 2, 3, 4])creates an array of all the possible permutations of [1, 2, 3, 4], with each permutation having a length of 4 (i.e., the length of original array)ExampleThe code for this will be −const arr = [1, 2, 3, 4]; const permute = (arr = [], res = [], used = []) => { let i, ch; for (i = 0; i < arr.length; i++) { ch = arr.splice(i, 1)[0]; ... Read More
Suppose, we have an array of objects containing data about likes of some users like this −const arr = [ {"user":"dan", "liked":"yes", "age":"22"}, {"user":"sarah", "liked":"no", "age":"21"}, {"user":"john", "liked":"yes", "age":"23"}, ];We are required to write a JavaScript function that takes in one such array. The function should construct another array based on this array like this −const output = [ {"dan":"yes"}, {"sarah":"no"}, {"john":"yes"}, ];Exampleconst arr = [ {"user":"dan", "liked":"yes", "age":"22"}, {"user":"sarah", "liked":"no", "age":"21"}, {"user":"john", "liked":"yes", "age":"23"}, ]; const mapToPair = (arr = []) => { const result = arr.map(obj => ... Read More
We are required to write a JavaScript function that takes in an array of Numbers as the first argument and a target sum Number as the second argument.The function should return an array of all those subarrays from the original array whose elements sum to make the target sum. We can use a single number twice to achieve the sum.For example −If the input array and number are −const arr = [1, 2, 4]; const sum = 4;then the output should be −const output = [ [1, 1, 1, 1], [1, 1, 2], [2, 2], [4] ... Read More
Suppose, we have an array of objects like this −const arr = [ {"id":7, "name":"Kuwait", "parentId":2}, {"id":4, "name":"Iraq", "parentId":2}, {"id":10, "name":"Qatar", "parentId":2}, {"id":2, "name":"Middle East", "parentId":1}, {"id":3, "name":"Bahrain", "parentId":2}, {"id":6, "name":"Jordan", "parentId":2}, {"id":8, "name":"Lebanon", "parentId":2}, {"id":1, "name":"Africa/Middle East", "parentId":null}, {"id":5, "name":"Israel", "parentId":2}, {"id":9, "name":"Oman", "parentId":2} ];We are required to write a JavaScript function that takes in one such array. The function should then prepare a new array that contains the objects grouped according to their parents.Therefore, the output should look like this −const output = [ ... Read More
Suppose, we have two arrays, let’s say arr1 and arr2. The elements of arr2 are distinct, and all elements in arr2 are also in arr1.We are required to write a JavaScript function that takes in two such arrays and sorts the elements of arr1 such that the relative ordering of items in arr1 are the same as in arr2. Elements that don't appear in arr2 should be placed at the end of arr1 in ascending order.For example− If the two input arrays are −const arr1 = [2, 3, 1, 3, 2, 4, 6, 7, 9, 2, 19]; const arr2 = ... Read More
We are required to write a JavaScript function that takes in an array of numbers as the first and the only argument.The function should then return the length of the longest continuous subarray from the array that only contains elements in a strictly increasing order.A strictly increasing sequence is the one in which any succeeding element is greater than all its preceding elements.Exampleconst arr = [5, 7, 8, 12, 4, 56, 6, 54, 89]; const findLongest = (arr) => { if(arr.length == 0) { return 0; }; let max = 0; let count ... Read More
The degree of an array of literals is defined as the maximum frequency of any one of its elements.const arr = [1, 2, 3, 3, 5, 6, 4, 3, 8, 3];The degree of this array is 4, because 3 is repeated 4 times in this array.We are required to write a JavaScript function that takes in an array of literals. The task of our function is to find the length of the smallest continious subarray from the array whose degree is same as of the whole array.Exampleconst arr = [1, 2, 3, 3, 5, 6, 4, 3, 8, 3]; const ... Read More