Suppose we have an array that contains some dates like this −const arr = [    [ '02/13/2015', 0.096 ],    [ '11/15/2013', 0.189 ],    [ '05/15/2014', 0.11 ],    [ '12/13/2013', 0.1285 ],    [ '01/15/2013', 0.12 ],    [ '01/15/2014', 0.11 ],    [ '02/14/2014', 0.11 ],    [ '03/14/2014', 0.11 ],    [ '01/15/2015', 0.096 ],    [ '07/15/2015', 0.096 ],    [ '04/15/2013', 0.12 ],    [ '04/15/2014', 0.11 ],    [ '05/15/2013', 0.12 ],    [ '06/14/2013', 0.12 ],    [ '06/16/2014', 0.11 ],    [ '07/15/2013', 0.12 ],    [ '07/15/2014', 0.11 ], ... Read More

We are required to write a JavaScript function that takes in an array of strings and returns an object corresponding to the strings.For example −If the array is −const arr = [    "country.UK.level.1",    "country.UK.level.2",    "country.US.level.1",    "country.UK.level.3" ];Then the output should be −const output = {    "country": [        {"UK" : {"level" : ["1", "2", "3"]}},        {"US" : {"level" : ["1", "2"]}}   ] } ConditionsStrings stored in the str array will not be sorted and the code should be robust against that.Strings will follow the x.y.x.y... pattern, where x will be ... Read More

We are required to write a JavaScript function that takes in an array of strings. The function should join all the strings of the array, replace all the whitespaces with dash "-", and return the string thus formed.For example: If the array is −const arr = ["QA testing promotion ", " Twitter  ", "Facebook ", "Test"];Then the output should be −const output = "QA-testing-promotion-Twitter-Facebook-Test";ExampleFollowing is the code −const arr = ["QA testing promotion ", " Twitter ", "Facebook ", "Test"]; const joinArr = arr => {    const arrStr = arr.join('');    let res = '';    for(let i = ... Read More

Given an array X of multiple values (e.g. [-3, 5, 1, 3, 2, 10]), We are required to write a function that removes any negative values in the array.Once the function finishes its execution the array should be composed of just positive numbers. We are required to do this without creating a temporary array and only using pop method to remove any values in the array.ExampleFollowing is the code −// strip all negatives off the end while (x.length && x[x.length - 1] < 0) {    x.pop(); } for (var i = x.length - 1; i >= 0; i--) { ... Read More

Given an array of integers, we are required to write a function that takes this array and finds the one element that appears an odd number of times. There will always be only one integer that appears an odd number of times.We will approach this problem by sorting the array. Once sorted, we can iterate over the array to pick the element that appears for odd number of times.ExampleFollowing is the code −const arr = [20, 1, -1, 2, -2, 3, 3, 5, 5, 1, 2, 4, 20, 4, -1, -2, 5]; const findOdd = arr => {    let ... Read More

We are required to write a JavaScript function that takes in an array that contains some numbers, some strings and some falsy values.Our function should return the biggest Number from the array.For example −If the input array is the following with some undefined values −const arr = [23, 'hello', undefined, null, 21, 65, NaN, 1, undefined, 'hii'];Then the output should be 65ExampleFollowing is the code −const arr = [23, 'hello', undefined, null, 21, 65, NaN, 1, undefined, 'hii']; const pickBiggest = arr => {    let max = -Infinity;    for(let i = 0; i < arr.length; i++){     ... Read More

We are required to write a JavaScript function that takes in an array of Numbers.The function should return the middlemost element of the array.For example −If the array is −const arr = [1, 2, 3, 4, 5, 6, 7];Then the output should be 4ExampleFollowing is the code −const arr = [1, 2, 3, 4, 5, 6, 7]; const middle = function(){    const half = this.length >> 1;    const offset = 1 - this.length % 2;    return this.slice(half - offset, half + 1); }; Array.prototype.middle = middle; console.log(arr.middle()); console.log([1, 2, 3, 4, 5, 6].middle());OutputThis will produce the following output on console −[ 4 ] [ 3, 4 ]

We are required to write a JavaScript function that takes in an array of literals and returns a new array that have elements of the original array chunked into subarrays of length exactly 2.Now if the length of original array is not exactly divisible by 2, then the last subarray should have only one element.For example, If the input array is −const arr = [1, 2, 3, 4, 5, 6, 7];Then the output should be −const output = [[1, 2], [3, 4], [5, 6], [7]]ExampleFollowing is the code −const arr = [1, 2, 3, 4, 5, 6, 7]; const chunk ... Read More

Suppose, we have two objects, say A and B like these −const A = { activity: 'purchased', count: undefined, time: '09:05:33' }; const B = { activity: 'purchased', count: '51', time: undefined }; We are required to write a JavaScript function that merges these two objects, keeping in mind if any key has a truthy value then it should not be overwritten by a key having falsy value.If we do this simply by using the spread operator, it will not keep track of truth or falsy values.Therefore, we have to do this using an iterative approach.ExampleFollowing is the code −const A ... Read More

Suppose, we have an array of objects like this −const arr = [    {flag: true, other: 1},    {flag: true, other: 2},    {flag: false, other: 3},    {flag: true, other: 4},    {flag: true, other: 5},    {flag: true, other: 6},    {flag: false, other: 7} ];We are required to write a JavaScript function that takes in one such array and sorts it based on the following conditions −If arr.flag === false, the matching element gets placed first in the array, but only after the previous matching elements.The elements that do not match, remain in the same order ... Read More