Cartesian ProductThe Cartesian product of two sets (arrays) A and B, denoted A × B, is the set (array) of all ordered pairs (a, b) where a is in A and b is in B.In simpler terms, a cartesian product of two arrays is a permutation of all possible arrays of two elements whose first element belongs to the first array and the second element belongs to the second array.For example − If the two arrays are −const arr1 = [1, 2, 3]; const arr2 = [4, 5];Then their cartesian product will be −const product = [[1, 4], [1, 5], ... Read More

Suppose, we have an array of Strings that contains month-year combined strings like this −const arr = ["2009-feb", "2009-jan", "2010-mar", "2010-jan", "2011-jul", "2011-sep", "2011-jan", "2012-jan", "2012-dec", "2012-feb", "2013-may", "2013-jul", "2013-jun", "2014-jan", "2014-dec", "2014-may", "2015-may", "2015-jan", "2015-jun", "2016-jan", "2016-dec"];We are required to write a JavaScript function that takes in one such array and sorts these dates in oldest to latest order.ExampleThe code for this will be −const arr = ["2009-feb", "2009-jan", "2010-mar", "2010-jan", "2011-jul", "2011-sep", "2011-jan", "2012-jan", "2012-dec", "2012-feb", "2013-may", "2013-jul", "2013-jun", "2014-jan", "2014-dec", "2014-may", "2015-may", "2015-jan", "2015-jun", "2016-jan", "2016-dec"]; const sorter = (a, b) => {    const getDate = ... Read More

We are required to write a JavaScript function that takes in a number as one and the only argument. The function should then return a randomly generated string of the length specified by the argument.The character set to be used for the string generation should only contain uppercase and lowercase alphabets (no whitespaces, punctuations or numerals).ExampleThe code for this will be −const num = 13; const randomString = (len = 1) => {    const charSet =    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';    let randomString = '';    for (let i = 0; i < len; i++) {       let randomPoz ... Read More

We are required to write a JavaScript function that takes in an array of literals as the first argument and a string as the second argument. Our function should return the count of the number of times that string (provided by second argument) appears anywhere in the array.ExampleThe code for this will be −const arr = ["word", "a word", "another word"]; const query = "word"; const findAll = (arr, query) => {    let count = 0;    count = arr.filter(el => {       return el.indexOf(query) != -1;    }).length;    return count; }; console.log(findAll(arr, query));OutputAnd the output in the console will be −3

Let's say we have such an array −const arr = [A, A, B, B, C, C, D, E];We are required to create an algorithm so that it will find all the combinations that add up to the whole array, where none of the elements are repeated.Example combinations −[A, B, C, D, E] [A, B, C] [A, B, C, D] [A, B, C, E] [A, B, C] [A, B, C] [D, E]Explanation[A, B, C] [A, B, C] [D, E] and [A, B, C] [D, E] [A, B, C] are the same combinations. Also, the ordering with the subsets doesn't matter as ... Read More

We are required to write a JavaScript function that takes in two arrays of equal length. The function should multiply the corresponding (by index) values in each, and sum the results.For example: If the input arrays are −const arr1 = [2, 3, 4, 5]; const arr2 = [4, 3, 3, 1];then the output should be 34, because,(4*2+3*3+4*3+5*1) = 34ExampleThe code for this will be −const arr1 = [2, 3, 4, 5]; const arr2 = [4, 3, 3, 1]; const produceAndAdd = (arr1 = [], arr2 = []) => {    let sum = 0;    for(let i=0; i < arr1.length; i++) {       const product = (arr1[i] * arr2[i]);       sum += product;    };    return sum; }; console.log(produceAndAdd(arr1, arr2));OutputAnd the output in the console will be −34

Suppose, we have a JSON Array that contains data about some tickets like this −const arr = [    {       "quantity": "1",       "description": "VIP Ticket to Event"    },    {       "quantity": "1",       "description": "VIP Ticket to Event"    },    {       "quantity": "1",       "description": "VIP Ticket to Event"    },    {       "quantity": "1",       "description": "Regular Ticket to Event"    },    {       "quantity": "1",       "description": "Regular Ticket to ... Read More

We are required to write a JavaScript function that takes in a string of any variable length that represents a number.Our function is supposed to convert the number string to the corresponding letter string.For example − If the number string is −const str = '78956';Then the output should be −const output = 'ghief';If the number string is −const str = '12345';Then the output string should be −const output = 'lcde';Notice how we didn't convert 1 and 2 to alphabets separately because 12 also represents an alphabet. So we have to consider this case while writing our function.We, here, assume that ... Read More

Suppose we have an Object of Objects like this −const obj = {    "CAB": {       name: 'CBSSP',       position: 2    },    "NSG": {       name: 'NNSSP',       position: 3    },    "EQU": {       name: 'SSP',       position: 1    } };We are required to write a JavaScript function that takes in one such array and sorts the sub-objects on the basis of the 'position' property of sub-objects (either in increasing or decreasing order).ExampleThe code for this will be −const obj = { ... Read More

Suppose, we have an array of objects that contains data about some movies like this −const arr = [    {id: "1", name: "Snatch", type: "crime"},    {id: "2", name: "Witches of Eastwick", type: "comedy"},    {id: "3", name: "X-Men", type: "action"},    {id: "4", name: "Ordinary People", type: "drama"},    {id: "5", name: "Billy Elliot", type: "drama"},    {id: "6", name: "Toy Story", type: "children"} ];We are required to write a JavaScript function that takes in one such array as the first argument and an id string as the second argument. Then our function should search for the object ... Read More