We are required to write a JavaScript function that takes in an array of numbers. Then the function should return the index of the smallest number in the array.ExampleThe code for this will be −const arr = [3, 56, 56, 23, 7, 76, -2, 345, 45, 76, 3]; const lowestIndex = arr => {    const creds = arr.reduce((acc, val, ind) => {       let { num, index } = acc;       if(val < num){          num = val;          index = ind;       };       return { num, index };    }, {       num: Infinity,       index: -1    });    return creds.index; }; console.log(lowestIndex(arr));OutputThe output in the console −6

Suppose we have an array of objects containing some years and weeks data like this −const arr = [    {year: 2017, week: 45},    {year: 2017, week: 46},    {year: 2017, week: 47},    {year: 2017, week: 48},    {year: 2017, week: 50},    {year: 2017, week: 52},    {year: 2018, week: 1},    {year: 2018, week: 2},    {year: 2018, week: 5} ];We are required to write a JavaScript function that takes in one such array. The function should return a new array where all the objects that have common value for the "year" property are grouped into ... Read More

We are required to write a JavaScript function that takes in an array of numbers representing ages of some people.Then the function should bring all the ages less than 18 to the front of the array without using any extra memory.ExampleThe code for this will be −const ages = [23, 56, 56, 3, 67, 8, 4, 34, 23, 12, 67, 16, 47]; const sorter = (a, b) => {    if (a < 18) {       return -1;    };    if (b < 18) {       return 1;    };    return 0; } const sortByAdults = arr => {    arr.sort(sorter); }; sortByAdults(ages); console.log(ages);OutputThe output in the console −[    16, 12, 4, 8, 3, 23, 56,    56, 67, 34, 23, 67, 47 ]

Suppose we have a two-dimensional array of numbers like this −const arr = [    [1, 3, 2],    [5, 2, 1, 4],    [2, 1] ];We are required to write a JavaScript function that groups all the identical numbers into their own separate subarray, and then the function should sort the group array to place the subarrays into increasing order.Therefore, finally the new array should look like −const output = [    [1, 1, 1],    [2, 2, 2],    [4], [3],    [5] ];ExampleThe code for this will be −const arr = [    [1, 3, 2],   ... Read More

We are required to write a JavaScript function that takes in a string as the first argument and an array of numbers. Our function should replace all the characters in the string at indices that are specified by the array elements taken as the second argument with an asterisk.ExampleThe code for this will be −const str = "Lorem ipsum dolor sit amet consectetur adipiscing elit"; const arr = [4, 7, 9, 12, 15]; const replceWithAsterisk = (str, indices) => {    let res = '';    res = indices.reduce((acc, val) => {       acc[val] = '*';     ... Read More

Suppose, we have a JSON object like this −const obj = {    a: {       someKey: {          propOne: '',          enabled: true       }    },    b: {       someKey: {          propOne: '',          enabled: false       }    },    c: {       someKey: {          propOne: '',          enabled: false       }    },    someKey: {       ab: {     ... Read More

Suppose, we array of arrays like this −const arr = [    [-73.9280684530257, 40.8099975343718],    [-73.9282820374729, 40.8100875554645],    [-73.9280124002104, 40.8103130893677],    [-73.927875543761, 40.8102554080229],    [-73.9280684530257, 40.8099975343718] ];Here each subarray represents a point on a 2-D plane, and each point is a vertex of n sided polygon where n is the number of subarrays in the input arrays.We are required to write a JavaScript function that takes in one such array and returns a new array of n subarrays, each representing the midpoint of corresponding sides of the polygon.ExampleThe code for this will be −const arr = [    [-73.9280684530257, 40.8099975343718],    [-73.9282820374729, 40.8100875554645],    [-73.9280124002104, 40.8103130893677],    [-73.927875543761, 40.8102554080229],    [-73.9280684530257, 40.8099975343718] ]; const findCenters = arr => {    const centerArray = [];    for(i = 0; i

Suppose we have two arrays, the first array contains the scheduled date for some events and the second array contains the names of those events, like this −const dates = [    {       id:"1",       date:"2017-11-07"    },    {       id:"1",       date:"2017-11-08"    },    {       id:"2",       date:"2017-11-07"    },    {       id:"2",       date:"2017-11-08"    } ]; const names = [    {       id:"1",       name:"Pervies, Peter"    },    {   ... Read More

We are required to write a JavaScript function that takes in an array of literals and returns the count of elements that appears for the most number of times in the array.ExampleThe code for this will be −let arr = [2, 8, 4, 8, 6, 4, 7, 8]; const countOccurence = arr => {    const max = arr.reduce((acc, val) => {       return Math.max(acc, val);    }, -Infinity);    const count = arr.filter(el => {       return el === max;    });    const { length } = count;    return length; }; console.log(countOccurence(arr));OutputThe output in the console −3

Suppose we have an array of arrays like this −const arr = [    [       "Serta",       "Black Friday"    ],    [       "Serta",       "Black Friday"    ],    [       "Simmons",       "Black Friday"    ],    [       "Simmons",       "Black Friday"    ],    [       "Simmons",       "Black Friday"    ],    [       "Simmons",       "Black Friday"    ] ];We are required to write a JavaScript function that ... Read More