Suppose, we have two arrays like these −const input = ['S-1', 'S-2', 'S-3', 'S-4', 'S-5', 'S-6', 'S-7', 'S-8']; const sortingArray = ["S-1", "S-5", "S-2", "S-6", "S-3", "S-7", "S-4", "S-8"];We are required to write a JavaScript function that takes in two such arrays as first and second argument respectively.The function should sort the elements of the first array according to their position in the second array.The code for this will be −Exampleconst input = ['S-1', 'S-2', 'S-3', 'S-4', 'S-5', 'S-6', 'S-7', 'S-8']; const sortingArray = ["S-1", "S-5", "S-2", "S-6", "S-3", "S-7", "S-4", "S-8"]; const sortByReference = (arr1 = [], arr2 = ... Read More

Suppose, we have the following JSON object −const obj = {    "context": {       "device": {          "localeCountryCode": "AX",          "datetime": "3047-09-29T07:09:52.498Z"       },       "currentLocation": {          "country": "KM",          "lon": -78789486,       }    } };We are required to write a JavaScript recursive function that initially takes in one such array.The function should split the above object into a "label" - "children" format.Therefore, the output for the above object should look like −const output = {   ... Read More

Suppose we have the following nested JSON object −const obj = {    id: 1,    title: 'hello world',    child: {       id: null,       title: 'foobar',       child: {          id: null,          title: 'i should be in results array '       }    },    foo: {       id: null,       title: 'i should be in results array too!' },       deep: [       {          id: null,         ... Read More

Suppose, we have an array of objects like this −const arr = [    {"time":"18:00:00"},    {"time":"10:00:00"},    {"time":"16:30:00"} ];We are required to write a JavaScript function that takes in one such array and does the following −Extract the times from the json code: so: 18:00:00, 10:00:00, 16:30:00Convert the times to this: [18,0], [10,0], [16,30]Put it in an array.Return the final array.ExampleThe code for this will be −const arr = [    {"time":"18:00:00"},    {"time":"10:00:00"},    {"time":"16:30:00"} ]; const reduceArray = (arr = []) => {    let res = [];    res = arr.map(obj => {       return obj['time'].split(':').slice(0, 2).map(el => {          return +el;       });    });    return res; }; console.log(reduceArray(arr));OutputAnd the output in the console will be −[ [ 18, 0 ], [ 10, 0 ], [ 16, 30 ] ]

Suppose, we have an object like this −const obj = {    "part1": [{"id": 1, "a": 50}, {"id": 2, "a": 55}, {"id": 4, "a": 100}],    "part2":[{"id": 1, "b": 40}, {"id": 3, "b": 45}, {"id": 4, "b": 110}] };We are required to write a JavaScript function that takes in one such object. The function should merge part1 and part2 of the object to form an array of objects like this −const output = [    {"id": 1, "a": 50, "b": 40},    {"id": 2, "a": 55},    {"id": 3, "b": 45},    {"id": 4, "a": 100, "b": 110} ];ExampleThe code ... Read More

We have an array that holds several objects named student, each object student has several properties, one of which is an array named grades −const arr = [    {       name: "Student 1",       grades: [ 65, 61, 67, 70 ]    },    {       name: "Student 2",       grades: [ 50, 51, 53, 90 ]    },    {       name: "Student 3",       grades: [ 0, 20, 40, 60 ]    } ];We need to create a function that loops through the student's array ... Read More

Suppose, we have a nested array of numbers like this −const arr = [23, 6, [2, [6, 2, 1, 2], 2], 5, 2];We are required to write a program that should print the numbers (elements) of this array to the screen.The printing order of the numbers should according to the level upto which they are nested.Therefore, the output for the above input should look like this −23 6    2       6       2       1       2    2 5 2ExampleThe code for this will be −     ... Read More

Suppose, we have an array of objects like this −const arr = [    {       "parentIndex": '0' ,       "childIndex": '3' ,       "parent": "ROOT",       "child": "root3"    },    {       "parentIndex": '3' ,       "childIndex": '2' ,       "parent": "root3" ,       "child": "root2"    },    {       "parentIndex": '3' ,       "childIndex": '1' ,       "parent": "root3" ,       "child": "root1"    } ];We are required to write a JavaScript ... Read More

Suppose, we have three arrays of numbers like these −const code = [123, 456, 789]; const year = [2013, 2014, 2015]; const period = [3, 4, 5];We are required to write a JavaScript function that takes in three such arrays. The function should then construct an array of objects based on these three arrays like this −const output = [    {"code": 123, "year": 2013, "period": 3},    {"code": 456, "year": 2014, "period": 4},    {"code": 789, "year": 2015, "period": 5} ];ExampleThe code for this will be −const code = [123, 456, 789]; const year = [2013, 2014, 2015]; const ... Read More

We are required to write a JavaScript function that takes in an array of strings as the first argument and a single character as the second argument.The function should return true if the character specified by second argument exists in any of the strings of the array, false otherwise.ExampleThe code for this will be −const arr = ['first', 'second', 'third', 'last']; const searchForLetter = (arr = [], letter = '') => {    for(let i = 0; i < arr.length; i++){       const el = arr[i];       if(!el.includes(letter)){          continue;       ... Read More