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Web Development Articles
Page 48 of 801
Limiting elements occurrences to n times in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of integers, arr, that may contain duplicates as the first argument, and a number, num, as the second and final argument.The task of our function is to iterate through the array and check whether there exists some number that appears for more than n times in the array.If there exists any such element, we should delete its extra occurrences to limit its occurrence to at most num.For example, if the input to the function is −Inputconst arr = [4, 1, 3, 1, 4, 1, 3, 4, 2]; ...
Read MoreEncoding string based on character frequency in JavaScript
ProblemWe are required to write a JavaScript function that takes in a string, str, as the first and the only argument.Our function should create a new string based on the input string where each character in the new string is '(' if that character appears only once in the original string, or ')' if that character appears more than once in the original string.And we should ignore capitaliFor example, if the input to the function is −Inputconst str = 'Success';Outputconst output = ')())())';ExampleFollowing is the code −const str = 'Success'; const mapString = (str = '') => { const ...
Read MoreArray index to balance sums in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of integers, arr, as the first and the only argument.Our function is required to pick and return one such index from the array such that the sum of elements on its left side is equal to the sum of elements on its right side. If there exists no such index in the array, we should return -1.For example, if the input to the function is −Inputconst arr = [1, 2, 3, 4, 3, 2, 1];Outputconst output = 3;Output ExplanationBecause the sum of elements at either side of ...
Read MoreCounting possible APs within an array in JavaScript
Arithmetic ProgressionArithmetic Progression (AP) is a sequence of numbers such that the difference of any two consecutive numbers is a constant value (aka common difference).For instance, 1, 2, 3, 4, 5, 6, … is an AP, which has a common difference equal to 1 (2 -1).ProblemWe are required to write a JavaScript function that takes in an array of integers, arr, as the first and the only argument.The task of our function is to return the number of arithmetic progressions of size 3 that are possible from that list. In each progression, the differences between the elements must be the ...
Read MoreReturning only odd number from array in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of integers, arr, as the first and the only argument.The array either consists of all even numbers and just one odd number or consists of all odd numbers and just one even number. Our function should return this one different element from the array.For example, if the input to the function is −Inputconst arr = [5, 9, 7, 11, 34, 23, 77];Outputconst output = 34;Output ExplanationBecause the array consists of all odd numbers but 34 which is even.ExampleFollowing is the code −const arr = [5, 9, 7, ...
Read MoreConverting alphabets to Greek letters in JavaScript
ProblemWe are required to write a JavaScript function that takes in a string of uppercase English alphabets, str, as the first and the only argument.Consider the following mapping between English and Greek letters −A=α (Alpha) B=β (Beta) D=δ (Delta) E=ε (Epsilon) I=ι (Iota) K=κ (Kappa) N=η (Eta) O=θ (Theta) P=ρ (Rho) R=π (Pi) T=τ (Tau) U=μ (Mu) V=υ (Upsilon) W=ω (Omega) X=χ (Chi) Y=γ (Gamma)For all the alphabets that have a Greek mapping our function should create a new string in which the English letter is replaced by corresponding Greek letter and if there exists no mapping we should persist ...
Read MoreReturning just greater array in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of positive integers, arr, as the first and the only argument.Our function should first join the numbers present in the array and find the single number represented by the array and then return a new array that represents the number which is greater than the input array number by a magnitude of 1.For example, if the input to the function is −Inputconst arr = [6, 7, 3, 9];Outputconst output = [6, 7, 4, 0];Output ExplanationBecause the number represented by input array is 6739 and the required number ...
Read MoreFinding length of repeating decimal part in JavaScript
ProblemWe are required to write a JavaScript function that takes in a number, num, as the first and the only argumentOur function should do two thingsFirst of all, it should check whether the number is prime with 10 or not, if its not, we should return -1 (a number is prime with any other number if the only common factor they share is 1).If the number is prime with 10, then we should return the length of the decimal part which repeats itself, when that very number divides 1.For example, if the input to the function is −Inputconst num = ...
Read MoreSorting one string by the order of second in JavaScript
ProblemWe are required to write a JavaScript function that takes in two strings, str1 and str2 as the first and the second argument.Our function should sort str1 according to the order of characters as they appear in str2For example, if the input to the function is −Inputconst str1 = 'coding'; const str2 = 'gncabdi';Outputconst output = 'gncdio';Output ExplanationThe characters that appear first in str2 are placed first followed by the ones that comes later and lastly followed by the letters absent in str2.ExampleFollowing is the code −const str1 = 'coding'; const str2 = 'gncabdi'; const sortByOrder = (str1 = '', ...
Read MoreAdding binary without converting in JavaScript
ProblemWe are required to write a JavaScript function that takes in two binary strings str1 and str2 as the first and the second argumentOur function should return the sum of the two binary numbers. We are not allowed to convert the binary numbers into decimal and then add and the resulting sum should contain no zeros at all.For example, if the input to the function is −Inputconst str1 = '1101'; const str2 = '10111';Outputconst output = '100100';ExampleFollowing is the code −const str1 = '1101'; const str2 = '10111'; const addBinary = (str1 = '', str2 = '') => { ...
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