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Suppose, we have a reference to an object −let test = {};This object will potentially (but not immediately) have nested objects, something like −test = {level1: {level2: {level3: "level3"}}};We are required to write a JavaScript function that takes in one such object as the first argument and then any number of key strings as the arguments after.The function should determine whether or not the nested combination depicted by key strings exist in the object.ExampleThe code for this will be −const checkNested = function(obj = {}){ const args = Array.prototype.slice.call(arguments, 1); for (let i = 0; i < args.length; ... Read More
We are required to write a JavaScript function that takes in a string. The function should count the number of vowels present in the string.The function should prepare an object mapping the count of each vowel against them.ExampleThe code for this will be −const str = 'this is an example string'; const vowelCount = (str = '') => { const splitString=str.split(''); const obj={}; const vowels="aeiou"; splitString.forEach((letter)=>{ if(vowels.indexOf(letter.toLowerCase()) !== -1){ if(letter in obj){ obj[letter]++; }else{ ... Read More
We are required to write a JavaScript function that takes two arrays, say arr1 and arr2. Our function should return a sorted array in lexicographical order of the strings of arr1 which are substrings of strings of arr2.ExampleThe code for this will be −const lexicographicalSort = (arr1 = [], arr2 = []) => { let i, j; const res = []; outer: for (j = 0; j < arr1.length; j++) { for (i = 0; i < arr2.length; i++) { if (arr2[i].includes(arr1[j])) { res.push(arr1[j]); ... Read More
We are required to write a JavaScript function that takes in an array of strings. The function should find all the substring and superstring combinations that exist in the array and return an array of those elements.For example − If the array is −const arr = ["abc", "abcd", "abcde", "xyz"];Then the output should be −const output = ["abc", "abcd", "abcde"];because the first two are the substring of last.ExampleThe code for this will be −const arr = ["abc", "abcd", "abcde", "xyz"]; const findStringCombinations = (arr = []) => { let i, j, res = {}; for (i = 0; ... Read More
We are required to write a JavaScript function that takes in an array of literal values. Our function should then return the highest occurrence of an array value, and if there's an equal occurrence, we should return the first selected value of the equal occurrences.const arr = ['25', '50', 'a', 'a', 'b', 'c']In this case, we should return 'a'const arr = ['75', '100', 'a', 'b', 'b', 'a']In this case, I should also get 'a'ExampleThe code for this will be −const arr = ['25', '50', 'a', 'a', 'b', 'c']; const arr1 = ['75', '100', 'a', 'b', 'b', 'a']; const getMostFrequentValue = ... Read More
We are required to write a JavaScript function that takes in a string. Our function is supposed to count the number of alphabets (uppercase or lowercase) in the array.For example − If the input string is −const str = 'this is a string!';Then the output should be −13ExampleThe code for this will be −const str = 'this is a string!'; const isAlpha = char => { const legend = 'abcdefghijklmnopqrstuvwxyz'; return legend.includes(char); }; const countAlphabets = (str = '') => { let count = 0; for(let i = 0; i < str.length; i++){ ... Read More
Suppose, we have an array of objects like this −const arr = [ { id: 1, score: 1, isCut: false, dnf: false }, { id: 2, score: 2, isCut: false, dnf: false }, { id: 3, score: 3, isCut: false, dnf: false }, { id: 4, score: 4, isCut: false, dnf: false }, { id: 5, score: 5, isCut: true, dnf: true }, { id: 6, score: 6, isCut: true, dnf: false }, { id: 7, score: 7, isCut: true, dnf: false }, { id: 8, score: 8, isCut: true, dnf: false ... Read More
Suppose, we have an array of arrays like this −const arr = [ [ ['firstName', 'Joe'], ['lastName', 'Blow'], ['age', 42], ['role', 'clerk'], [ ['firstName', 'Mary'], ['lastName', 'Jenkins'], ['age', 36], ['role', 'manager'] ] ] ];We are required to write a JavaScript function that takes in one such array. The function should construct an array of objects based on this array of arrays.The output array should ... Read More
We are required to write a JavaScript function that takes in an array of elements.Our function should check whether or not the array contains an integer value.We should return true if it does false otherwise.ExampleThe code for this will be −const arr = ["123", "", "21345", "90"]; const findInteger = (arr = []) => { const isInteger = num => { return typeof num === 'number'; }; const el = arr.find(isInteger); return !!el; }; console.log(findInteger(arr));OutputAnd the output in the console will be −false
We are required to write a JavaScript function that takes in a number as the first input and a maximum number as the second input.The function should generate four random numbers, which when summed should equal the number provided to function as the first input and neither of those four numbers should exceed the number given as the second input.For example − If the arguments to the function are −const n = 10; const max = 4;Then, const output = [3, 2, 3, 2];is a valid combination.Note that repetition of numbers is allowed.ExampleThe code for this will be −const total ... Read More