Library

Create a function that uses the copyWithin method to replace specified elements within an array.

Create a function that sets the UTC month of a given date object.

Create a function that takes a date and a year as arguments and returns a new date with the year set to the specified value using Date.prototype.setFullYear().

Write a function that takes in a date and returns the seconds within the minute in UTC time.

Create a function that takes a string and a number as arguments, and pads the string on the right side with spaces until the string reaches the desired length.

Write a function that loops through a Set using Set.prototype.forEach() method and returns an array containing the results of applying the provided function to each element.

Combine two arrays into a single array using the Array.prototype.concat() method

Write a function that accepts a date object and a number of seconds (0 - 59) and returns a new date object with the seconds set to the provided value. The operation should be done using the setUTCSeconds() method.

Implement a function that uses String's padStart method to add leading zeros to a number string to ensure it always has a minimum length

Create a function that replaces all instances of a given substring with another string within a larger string using String.prototype.replaceAll() method.

Implement a function that groups the elements of an array based on a given predicate function.

Implement an algorithm that manages the overbooking of an airline flight.

Write a function that accepts a string and a number as arguments, then returns the character at that position in the string. Use String.prototype.charAt() for this exercise.

Write a function that uses recursion to calculate the factorial of a given positive integer.

Implement a function that takes a Date object as input and returns a formatted string

Write a function that checks if an element is present in an array using Array.prototype.includes() method.

Create a function that takes in a string with extra white space at the beginning and end of the string, and returns a new string with that white space removed. Use String.prototype.trim().

Create a function that takes in a string and a length and returns a new string with the original string padded with leading spaces if it is shorter than the provided length.

Create a function that takes a string and returns an array of the char codes for each character in the string

Write a function that takes a string and removes any trailing whitespace at the end of it using String.prototype.trimEnd().

Write a function that joins two arrays into a single string using Array.prototype.join() method.

Create a function that takes a start time and an event duration and returns the end time of the event, using the Date.prototype.setHours() method to set the hours of the start time.

Create a Stock Advisor that recommends which stocks to buy based on certain parameters.

Write a function that finds the last index of a given element in an array using the Array.prototype.findLastIndex method.

Implement a function that returns the current month from Date object using Date.prototype.getMonth()

Create a function that uses Array.prototype.findLast() to find the last element in an array that matches a given condition. Return the element if it exists or null if it does not.

Create a function that uses the String.prototype.lastIndexOf() method to find the index of the last occurrence of a specified substring in a given string.

Convert a string to uppercase using String.prototype.toUpperCase();

Sort an array of words based on their alphabetical order using String.prototype.localeCompare() method.

Given an array of numbers and a start index, remove a certain number of elements from the array and replace them with new elements.

Implement normalize method to format a string removing all the accents

Create a function that takes a string and a number and pads that string with a specified character until it reaches the given length.

This kata focuses on using String.prototype.indexOf() method.

Write a function that replaces the first occurrence of a specific string in a given string.

Write a function that takes a string and a substring as arguments, and finds the last occurrence of the substring in the string. If the substring is not found, return -1.

Write a function that returns the value of a given string using the String.prototype.valueOf() method.

Write a function that checks whether a given string ends with the specified suffix or not.

Implement the Array.prototype.unshift() method without using built-in functions

Create a function that uses Array.prototype.every() to check if all the elements in an array meet a certain condition.

Create a function that takes a string as input and returns the string in all lowercase letters.

Create a function that returns an array of values of an array using the Array.prototype.values() method.

Given an array of person objects, sort them alphabetically by their last name using String.prototype.localeCompare().

Write a function that takes a date object and a number of seconds and returns a new date object with the seconds set to the provided value. Example input: setSeconds(new Date('2022-10-10T10:10:10'), 30) Expected output: new Date('2022-10-10T10:10:30')

Given an array of objects, group the objects based on a specific key and return a map object.

Create a function that takes two parameters: a string and a regular expression. The function should return an array of all matches found in the string using the regular expression.

Create a function that repeats a given string n times.

Complete the functions provided to properly utilize the Date.now() method.

Create a function that greets the user depending on the current hour of the day.

Implement a function that adds a value to a set using Set.prototype.add().

Write a function that takes a date object and a number representing the desired month, and sets the month of the date to the given month.

Create an Inventory Management System that allows users to add, remove and update items in the inventory.

Create a function that sorts an array of strings in alphabetical order using String.prototype.localeCompare()

Create a function that accepts a string and a target length. If the length of the string is less than the target length, pad the string with spaces at the beginning until the target length is reached. If the string length is greater than or equal to the target length, return the original string.

Create a function that removes white space at the end of a given string using String.prototype.trimEnd().

Write a function that takes in a string and uses precision cutting to remove all occurrences of the letter 'e'. Return the resulting string.

Create a function that accepts a Set and a value to remove, and returns the updated Set after deleting the value.

Implement a function that returns the character at the specified index of a given string.

Create a function that transforms a given string to uppercase, using String.prototype.toLocaleUpperCase()

Given a date, return the UTC date.

Create a function that takes an array and reverse its order in place.

Write a function that takes an array of numbers and returns their sum, using Array.prototype.reduceRight().

Given two arrays, join them to create a new array.

Create a function that receives a string and a number n, the function should return the string repeated n times.

Create a function that takes a year (YYYY) and returns the date object with its year set to the provided year.

Create a function that returns the current minutes.

Write a function that returns the nth number in the Fibonacci sequence using recursion.

Implement a function that uses String.prototype.trimEnd() to trim whitespace at the end of a string.

Create a function that determines if two strings are anagrams of each other.

Implement a function that concatenates a given string 'n' times using the String.prototype.repeat() method.

Create a function that takes an array as input and returns a new array with the elements in reversed order.

Write a function that takes a string and returns an array of matched patterns using String.prototype.matchAll().

Create a function that takes an array as input and returns an array of the keys of the given array using Array.prototype.keys() method.

Write a function that concatenates two strings using the String.prototype.concat() method.

A kata that requires the student to use String.prototype.split() to split a given string into substrings and perform a specified operation on them.

Write a function that takes an array and a value and pushes the value to the end of the array using Array.prototype.push().

Write a function that normalizes a string using String.prototype.normalize().

Write a function that checks if a given string has a unicode character code point greater than or equal to 128. Use the String.prototype.codePointAt() method.

Write a function that checks if a given string includes a specific substring. Use String.prototype.includes() method.

Create a program that classifies music genres based on certain audio features

Write a function that checks if a given variable is an array. If it is an array, return true, otherwise return false.

Create a function that searches for the last index of a substring in an array using Array.prototype.lastIndexOf().

Write a function that returns whether a given string ends with the provided suffix or not

Write a function that takes a string and returns all its substrings of length 3 or greater. You must use String.prototype.slice() to achieve this.

Write a function that converts a given string to uppercase

Write a function that takes a string and regular expression as inputs, and returns an array of all matches found using the String.matchAll() method.

Write a function that converts a given string to its string representation using the toString() method.

In this kata, you will be working with the String.prototype.toLocaleUpperCase() method to convert a string to uppercase according to the user's locale.

Create a function that takes an array and a value as arguments and adds the value to the beginning of the array using the unshift() method.

Create a function that takes a Date object and returns a JSON string of the date in ISO format.

Complete the functions to find the index of an element in an array using Array.prototype.indexOf().

Implement the Array.prototype.with() method that returns a new array with the elements from the original array and the added elements.

Write a function that takes a string and a regular expression and returns an array of all the substrings in the string that match the regular expression.

Implement a function that checks if all elements from an array are included in a given Set using the built-in Set.prototype.has() method.

Create a function that takes in two parameters, a string and a substring, and checks if the string includes the substring. Return a boolean value.

Write a function that returns a substring of a given string, based on the start and end index provided

Write a function that takes a string and returns it in lowercase using the toLocaleLowerCase() method.

Create a function that takes a string and returns a new string that is a slice of the original string. The function should take two arguments, start and end, which represent the starting and ending indices of the slice.

Convert an array to a string with comma-separated values. The input array can contain numbers, strings, objects, or arrays.

Write a function that returns a substring of a given string, starting at a specified index and ending before a specified index.

Create a function that receives a string and a number as parameters. The function should return the string repeated `n` times, where n is the number passed as parameter.