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Javascript Articles
Page 363 of 534
Finding sum of all unique elements in JavaScript
We are required to write a JavaScript function that takes in an array of numbers with duplicate entries and sums all the duplicate entries to one index.For example: If the input array is −const input = [1, 3, 1, 3, 5, 7, 5, 4];OutputThen the output should be −const output = [2, 6, 7, 10, 4];// all the duplicate ones are summed to index 0// all the duplicate threes are summed to index 1 and so on.Therefore, let’s write the code for this function −ExampleThe code for this will be −const input = [1, 3, 1, 3, 5, 7, 5, ...
Read MoreSimilarities between different strings in JavaScript
We have two arrays of Numbers, and we are required to write a function intersection() that computes their intersection and returns an array that contains the intersecting elements in any order. Each element in the result should appear as many times as it shows in both arrays.For example:If input is −arr1 = ['hello', 'world', 'how', 'are', 'you']; arr2 = ['hey', 'world', 'can', 'you', 'rotate'];Then the output should be −['world', 'you'];Approach:Had the arrays been sorted, we could have used the two-pointer approach with initially both pointing to 0 the start of the respective array and we could have proceeded with increasing ...
Read MoreGrouping of same kind of numbers in JavaScript
We have an array of numbers like this −const arr = [-1, -2, -1, 0, -1, -2, -1, -2, -1, 0, 1, 0];We are required to write a JavaScript function that counts the consecutive groups of nonnegative (positives and 0) numbers in the array.Like here we have consecutive non negatives from index 3 to 3 (only one element, but still a cluster) which forms one group and then from 9 to end of array forms the second group.So, for this array, the function should return 2.Therefore, let’s write the code for this function −ExampleThe code for this will be −const ...
Read MoreFinding pandigital numbers using JavaScript
We are required to write a JavaScript function that takes in a string representing a number. The function returns true if the number is pandigital, false otherwise.A pandigital number is a number that contains all digits (0-9) at least once.Therefore, let’s write the code for this function −ExampleThe code for this will be −const numStr1 = '47458892414'; const numStr2 = '53657687691428890'; const isPandigital = numStr => { let legend = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']; for(let i = 0; i < numStr.length; i++){ if(!legend.includes(numStr[i])){ continue; ...
Read MoreConstructing array from string unique characters in JavaScript
We are required to write a JavaScript function that takes in a string and starts mapping its characters from 0.And every time, the function encounters a unique (non-duplicate) character it should increase the mapping count by 1 otherwise it should map the same number for duplicate characters.For example: If the string is −const str = 'heeeyyyy';Then the output should be −const output = [0, 1, 1, 1, 2, 2, 2, 2];Therefore, let’s write the code for this function −ExampleThe code for this will be −const str = 'heeeyyyy'; const mapString = str => { const res = []; ...
Read MoreSorting the numbers from within in JavaScript
We are required to write a JavaScript function that takes in an array of numbers and reorders the digit of all the numbers internally in a specific order (let’s say in ascending order for the sake of this problem).For example: If the array is −const arr = [543, 65, 343, 75, 567, 878, 87];Then the output should be −const output = [345, 56, 334, 57, 567, 788, 78];Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [543, 65, 343, 75, 567, 878, 87]; const ascendNumber = num => { const numArr ...
Read MoreDynamic programming to check dynamic behavior of an array in JavaScript
We are required to write a JavaScript function that takes in an array of strings, ordered by ascending length.The function should return true if, for each pair of consecutive strings, the second string can be formed from the first by adding a single letter either at the beginning or end.For example: If the array is given by −const arr = ["c", "ca", "can", "acan", "acane", "dacane"];Then our function should return trueTherefore, let’s write the code for this function.ExampleThe code for this will be −const arr = ["c", "ca", "can", "acan", "acane", "dacane"]; const isProgressive = arr => { for(let ...
Read MoreDeleting the last vowel from a string in JavaScript
We are required to write a JavaScript function that takes in a string and returns a new string with the last vowel of each word removed.For example: If the string is −const str = 'This is an example string';Then the output should be −const output = 'Ths s n exampl strng';Therefore, let’s write the code for this function −ExampleThe code for this will be −const str = 'This is an example string'; const removeLast = word => { const lastIndex = el => word.lastIndexOf(el); const ind = Math.max(lastIndex('a'), lastIndex('e'), lastIndex('i'), lastIndex('o'), lastIndex('u')); return word.substr(0, ind) + word.substr(ind+1, ...
Read MorePerforming the subtraction operation without the subtraction operator in JavaScript
We are required to write a JavaScript function that takes in two numbers and returns their difference but without using the (-) sign.Therefore, let’s write the code for this function −ExampleThe code for this will be −const num1 = 56; const num = 78; const subtractWithoutMinus = (num1, num2) => { if(num2 === 0){ return num1; }; return subtractWithoutMinus(num1 ^ num2, (~num1 & num2)
Read MorePicking the odd one out in JavaScript
We are required to write a JavaScript function that takes in an array of literals that contains all similar elements but one.Our function should return the unlike number.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr = [2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4]; // considering that the length of array is atleast 3 const findUnlike = arr => { for(let i = 1; i < arr.length-1; i++){ if(arr[i] - arr[i-1] !== 0 && arr[i]-arr[i+1] === 0){ return arr[i-1]; ...
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