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

Suppose we have two arrays of literals like these −const arr1 = [1, 3, 2, 4, 5, 6]; const arr2 = [1, 2, 5];We are required to write a JavaScript function that takes in two such arrays. Then our function should return a new array that contains all the elements of arr1 but sorted according to arr2.Like the elements that appear in both the array should appear first according to their order in the second array followed by the elements only present in first array retaining their order.ExampleThe code for this will be −const arr1 = [1, 3, 2, 4, ... Read More

Suppose, we have an array of objects like this −const arr = [    {"title": "Assistant"},    {"month": "July"},    {"event": "Holiday"},    {"title": "Assistant"} ];We are required to write a JavaScript function that takes in one such array. Our function should then return a new array that contains all the object from the original array but the duplicate ones.ExampleThe code for this will be −const arr = [    {"title": "Assistant"},    {"month": "July"},    {"event": "Holiday"},    {"title": "Assistant"} ]; const removeDuplicate = arr => {    const map = {};    for(let i = 0; i < ... Read More

We are required to write a JavaScript function that takes in two. Our function should then return a new array that contains characters alternatively from both the strings.For example: If the two strings are −const str1 = 'abc'; const str2 = 'def';OutputThen the output should be −const output = 'adbecf';ExampleThe code for this will be −const str1 = 'abc'; const str2 = 'def'; const mergeAlternatively = (str1, str2) => {    const a = str1.split("").filter(el => !!el);    const b = str2.split("");    let mergedString = '';    for(var i = 0; i < a.length || i < b.length; i++){ ... Read More

We are required to write a JavaScript function that takes in a two-dimensional array of literals.Our function should return a new array that contains all the entries from the original array but the repeating ones.ExampleThe code for this will be −const arr = [    [1,2,3,4,5],    [3,4,6,7,8,2],    [7,2,4,9,11,15],    [10,12,3,7,11] ]; const removeDuplicates = arr => {    let map = {};    let res = [];    res = arr.map(el => {       return el.filter(val => {          if(map[val]){             return false;          };          map[val] = 1;          return true;       });    });    return res; }; console.log(removeDuplicates(arr));OutputThe output in the console −[ [ 1, 2, 3, 4, 5 ], [ 6, 7, 8 ], [ 9, 11, 15 ], [ 10, 12 ] ]

We are required to write a JavaScript function that takes in an array of Numbers. Our function should return a new array that contains all the elements from the original array that are greater than the cumulative sum of all elements up to that point. We are required to solve this problem using the Array.prototype.reduce() function.ExampleLet’s write the code for this function −const arr = [1, 2, 30, 4, 5, 6]; const retainGreaterElements = arr => {    let res = [];    arr.reduce((acc, val) => {       return (val > acc && res.push(val), acc + val);    }, 0);    return res; } console.log(retainGreaterElements(arr));OutputThe output in the console −[1, 2, 30]

Suppose, we have an array of numbers like this −const arr = [1, 2, 3, 4, 5, 6];We are required to write a JavaScript function that takes in one such array and returns a new array with corresponding elements of the array being the sum of all the elements upto that point from the original array.Therefore, for the above array, the output should be −const output = [1, 3, 6, 10, 15, 21];ExampleThe code for this will be −const arr = [1, 2, 3, 4, 5, 6]; const findCumulativeSum = arr => {    const creds = arr.reduce((acc, val) => ... Read More

We are required to write a JavaScript function that takes a string and an array of strings.Our function should return a new string, where all the occurrences of the word in the string that are present in the array are replaced by a whitespace.Our function should use the String.prototype.replace() method to solve this problem.ExampleThe code for this will be −var excludeWords = ["A", "ABOUT", "ABOVE", "ACROSS", "ALL", "ALONG", "AM", "AN", "AND", "ANY", "ASK", "AT", "AWAY", "CAN", "DID", "DIDN'T", "DO", "DON'T", "FOR", "FROM", "HAD", "HAS", "HER", "HIS", "IN", "INTO", "IS", "IT", "NONE", "NOT", "OF", "ON", "One", "OUT", "SO", "SOME", "THAT", "THE", ... Read More