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Articles by AmitDiwan
Page 395 of 839
Finding the balance of brackets in JavaScript
Given a string that consists of only two types of characters: "(" and ")". We are required to write a function that takes in one such string and balances the parentheses by inserting either a "(" or a ")" as many times as necessary. The function should then return the minimum number of insertions made in the string to balance it.For example: If the string is −const str = '()))';Then the output should be 2, because by prepending '((', we can balance the string.ExampleThe code for this will be −const str = '()))'; const balanceParanthesis = str => { ...
Read MoreIs element repeated more than n times in JavaScript
We are required to write a JavaScript function that takes in two arguments −An Array, say arr, of literals that may contain some repeating elements.A number, say limit.The function should validate that no element of the array is repeated more than limit number of times. If any element is repeated more than the limit the function should return false, true otherwise.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [4, 6, 7, 4, 2, 5, 7, 7, 4, 4, 3]; const validateElements = (arr, n) => { const counts = arr.reduce((acc, ...
Read MoreWriting table of number in array in JavaScript
We are required to write a JavaScript function that takes in two numbers, say m and n, and it returns an array of first n multiples of m.Therefore, let’s write the code for this function −ExampleThe code for this will be −const num1 = 4; const num2 = 6; const multiples = (num1, num2) => { const res = []; for(let i = num1; i
Read MoreCounting smaller and greater in JavaScript
Suppose, we have an array of literals like this −const arr = [3, 5, 5, 2, 23, 4, 7, 8, 8, 9];We are required to write a JavaScript function that takes in this array and a number, say n, and returns an object representing the count of elements greater than and smaller than n.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [3, 5, 5, 2, 23, 4, 7, 8, 8, 9]; const smallerLargerNumbers = (arr, num) => { return arr.reduce((acc, val) => { let { greater, smaller ...
Read MoreUsing one array to help filter the other in JavaScript
Suppose, we have an array and objects like these −Objects:const main = [ {name: "Karan", age: 34}, {name: "Aayush", age: 24}, {name: "Ameesh", age: 23}, {name: "Joy", age: 33}, {name: "Siddarth", age: 43}, {name: "Nakul", age: 31}, {name: "Anmol", age: 21}, ];Array:const names = ["Karan", "Joy", "Siddarth", "Ameesh"];We are required to write a JavaScript function that takes in two such arrays and filters the first array in place to contain only those objects whose name property is included in the second array.Therefore, let’s write the code for this function −ExampleThe code for this ...
Read MoreMapping string to Numerals in JavaScript
We are required to write a JavaScript function that takes in a string. It should print out each number for every corresponding letter in the string.For example:a = 1 b = 2 c = 3 d = 4 e =5 . . . y = 25 z = 25Note: Remove any special characters and spaces.So, if the input is −"hello man"Then the output should be −"8, 5, 12, 12, 15, 13, 1, 14"ExampleThe code for this will be −const str = 'hello man'; const charPosition = str => { str = str.split(''); const arr = []; const ...
Read MoreFinding the smallest fitting number in JavaScript
We are required to write a JavaScript function that takes in an array of numbers and returns a number which can exactly divide all the numbers in the array.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [4, 6, 34, 76, 78, 44, 34, 26, 88, 76, 42]; const dividesAll = el => { const result = []; let num; for (num = Math.floor(el / 2); num > 1; num--){ if (el % num === 0) { result.push(num); } }; return result; }; const dividesArray = arr => { return arr.map(dividesAll).reduce((acc, val) => { return acc.filter(el => val.includes(el)); }); }; console.log(dividesArray(arr));OutputThe output in the console will be −[ 2 ]
Read MoreSorting Array without using sort() in JavaScript
We are required to write a JavaScript function that takes in an array of numbers.The function should sort the array using the Array.prototype.sort() method, but, here, we are required to use the Array.prototype.reduce() method to sort the array.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [4, 56, 5, 3, 34, 37, 89, 57, 98]; const sortWithReduce = arr => { return arr.reduce((acc, val) => { let ind = 0; while(ind < arr.length && val < arr[ind]){ ind++; } acc.splice(ind, 0, val); return acc; }, []); }; console.log(sortWithReduce(arr));OutputThe output in the console will be −[ 98, 57, 89, 37, 34, 5, 56, 4, 3 ]
Read MoreSquared concatenation of a Number in JavaScript
We are required to write a JavaScript function that takes in a number and returns a new number in which all the digits of the original number are squared and concatenated.For example: If the number is −99Then the output should be −8181because 9^2 is 81 and 1^2 is 1.Therefore, let’s write the code for this function −ExampleThe code for this will be −const num = 9119; const squared = num => { const numStr = String(num); let res = ''; for(let i = 0; i < numStr.length; i++){ const square = Math.pow(+numStr[i], 2); ...
Read MoreRepeated sum of Number’s digits in JavaScript
We are required to write a JavaScript function that recursively sums up the digits of a number until it reduces to a single digit number.We are required to do so without converting the number to String or any other data type.Therefore, let’s write the code for this function −ExampleThe code for this will be −const num = 546767643; const sumDigit = (num, sum = 0) => { if(num){ return sumDigit(Math.floor(num / 10), sum + (num % 10)); } return sum; }; const sumRepeatedly = num => { while(num > 9){ num = sumDigit(num); }; return num; }; console.log(sumRepeatedly(num));OutputThe output in the console will be −3
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