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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 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
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
Suppose we have an array of literals like this −const arr = ['cat', 'dog', 'elephant', 'lion', 'tiger', 'mouse'];We are required to write a JavaScript function that takes in one such array as the first argument and then any number of strings as second and third and many more arguments.Then our function should remove all the strings from the array taken as first argument in place if that string is provided as argument to the function.ExampleThe code for this will be −const arr = ['cat', 'dog', 'elephant', 'lion', 'tiger', 'mouse']; const removeFromArray = (arr, ...removeArr) => { removeArr.forEach(item => { ... Read More