Suppose, we have the following array of objects −const arr = [    {"2015":11259750.05},    {"2016":14129456.9} ];We are required to write a JavaScript function that takes in one such array. The function should prepare an array of arrays based on the input array.Therefore, the output for the above array should look like −const output = [    [2015,11259750.05],    [2016,14129456.9] ];ExampleThe code for this will be −const arr = [    {"2015":11259750.05},    {"2016":14129456.9} ]; const mapToArray = (arr = []) => {    const res = [];    arr.forEach(function(obj,index){       const key= Object.keys(obj)[0];       const value = parseInt(key, 10);       res.push([value, obj[key]]);    });    return res; }; console.log(mapToArray(arr));OutputAnd the output in the console will be −[ [ 2015, 11259750.05 ], [ 2016, 14129456.9 ] ]

We are required to write a JavaScript program that provides users an input to fill in a number.And upon filling when the user clicks the button, we should display the sum of all the digits of the number.ExampleThe code for this will be −JavaScript Code −function myFunc() {    var num = document.getElementById('digits').value;    var tot = 0;    num.split('').forEach( function (x) {       tot = tot + parseInt(x,10);    }); document.getElementById('output').innerHTML = tot; }HTML Code − Submit OutputAnd the output will be &miuns;After clicking “Submit” −

We have a mixed array that we need to sort by alphabet and then by digit −const arr = ['Ab-1', 'Ab-11', 'Ab-12', 'ab-10', 'ab-100', 'ab-101', 'ab2', 'ab-3', 'ab-105'];ExampleThe code for this will be −const arr = ['Ab-1', 'Ab-11', 'Ab-12', 'ab-10', 'ab-100', 'ab-101', 'ab2', 'ab-3', 'ab-105']; const alphaNumericSort = (arr = []) => {    arr.sort((a, b) => {       const aPart = a.split('-');       const bPart = b.split('-');       return aPart[0].toLowerCase().localeCompare(bPart[0].toLowerCase()) || aPart[1] - bPart[1];    }); }; alphaNumericSort(arr); console.log(arr);OutputAnd the output in the console will be −[    'Ab-1', 'ab-2',    'ab-3', 'ab-10', ... Read More

Suppose, we have a 2-D array like this −const arr = [    [3, 1],    [2, 12],    [3, 3] ];We are required to write a JavaScript function that takes in one such array.The function should then create a new 2-D array that contains all elements initialized to undefined other than the element's index present in the input array.Therefore, for the input array, output[3][1] = 1; output[2][12] = 1; output[3][3] = 1;And rest all elements should be initialized to undefinedTherefore, the final output should look like −const output = [    undefined,    undefined,    [       ... Read More

Suppose we have the following array of objects −const arr = [    {       'name' : 'd',       'index' : 3    },    {       'name' : 'c',       'index' : 2    },    {       'name' : 'a',       'index' : 0    },    {       'name' : 'b',       'index' : 1    } ];We are required to write a JavaScript function that takes in one such array.The function should sort this array in increasing order according to ... Read More

Suppose we have an array of objects that contains data about some houses and price like this −const arr = [    {       "h_id": "3",       "city": "Dallas",       "state": "TX",       "zip": "75201",       "price": "162500"    },    {       "h_id": "4",       "city": "Bevery Hills",       "state": "CA",       "zip": "90210",       "price": "319250"    },    {       "h_id": "5",       "city": "New York",       "state": "NY",     ... Read More

We are required to write a JavaScript function that takes in an array of Numbers. Our function should iterate through the array and pick the greatest (largest) element from the array and return that element.ExampleThe code for this will be −const arr = [5, 3, 20, 15, 7]; const findGreatest = (arr = []) => {    let greatest = -Infinity;    if(!arr?.length){       return null;    };    for(let i = 0; i < arr.length; i++){       const el = arr[i];       if(el < greatest){          continue;       };       greatest = el;    };    return greatest; }; console.log(findGreatest(arr));OutputAnd the output in the console will be −20

Suppose, we have a nested array of arrays like this −const arr = [    ["LEFT", "RIGHT", "RIGHT", "BOTTOM", "TOP"],    ["RIGHT", "LEFT", "TOP"],    ["TOP", "LEFT"] ];We are required to write a JavaScript function that takes in one such array. The function then should pick the smallest subarray (smallest in sense of a number of elements contained) and return it.ExampleThe code for this will be −const arr = [    ["LEFT", "RIGHT", "RIGHT", "BOTTOM", "TOP"],    ["RIGHT", "LEFT", "TOP"],    ["TOP", "LEFT"] ]; const findShortest = (arr = []) => {    const res = arr.reduce((acc, val, ind) => ... Read More

Suppose, we have an array of objects like this −const arr = [    { Phase: "Phase 1", Step: "Step 1", Task: "Task 1", Value: "5" },    { Phase: "Phase 1", Step: "Step 1", Task: "Task 2", Value: "10" },    { Phase: "Phase 1", Step: "Step 2", Task: "Task 1", Value: "15" },    { Phase: "Phase 1", Step: "Step 2", Task: "Task 2", Value: "20" },    { Phase: "Phase 2", Step: "Step 1", Task: "Task 1", Value: "25" },    { Phase: "Phase 2", Step: "Step 1", Task: "Task 2", Value: "30" },    { Phase: ... Read More

We have got an array of objects. If one property of the object is the same as in another object, we consider it to be a duplicate entry.We want to group objects by this property and store information about how many times the "duplicate" occurred.   X A B O    Y X Z I    Y X Z U    X A B L    Y X Z KWe want to group by the first value.Another two properties are the same in each duplicate too, but comparing the first value will be enough.We need to display to the user a ... Read More