Library

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

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

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

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.

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

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.

Convert a string to an array of Unicode code points using String.prototype.codePointAt() method.

Create a function that concatenates two strings using the String.prototype.concat() method. The function should take two string parameters and return the concatenated string.

Implement normalize method to format a string removing all the accents

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

Create a function that will return an array in a localized way using the toLocaleString method.

Write a function that flattens nested arrays using Array.prototype.flat() method.

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

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

Write a function that checks if every element in an array satisfies a given condition.

Write a function that returns an array of char codes from a string

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

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

Implement equations using the Array.of() method to create arrays.

Write a function that returns the index of the first occurrence of a given element in an array using Array.prototype.indexOf(). If the element is not found in the array, return -1.

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 concatenates two strings using the String.prototype.concat() method.

Write a function that takes a date string as input and converts it to a UTC date string format.

Create a function that takes an array of numbers and returns the index of a given element. Use Array.prototype.findIndex() to implement the function.

Write a function that takes a string and returns an array of code points for each character in the string using String.prototype.codePointAt() method.

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

Create a function that counts the number of seconds in a given timestamp

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

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.

Create a function that receives a string and a regular expression pattern and returns an array of all the occurrences of the pattern in the string using String.prototype.matchAll().

Write a function that takes a date and returns the year in the hh:mm:ss format.

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

Implement a function that removes all unused items in a Set collection

Create a function that replaces all occurrences of a substring with a new string.

Create a function that repeats a given string n times.

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.

Write a function that uses the Date.prototype.getDay() method to determine the day of the week for a given date object.

Create a function that uses the String.prototype.replaceAll() method to replace all occurrences of a given substring within a string.

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

Create a function that takes a string and a number, and repeats the string the given number of times.

Replace all vowels in a string with a '-'.

Create a function that returns the current year using Date's built-in getFullYear method

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

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

Create a function that returns the current minutes.

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

Implement a function that takes a Date object and a number representing minutes and sets the UTC minutes of the Date object to the provided value. The function should return the updated Date object.

Implement a function that sets the milliseconds of a given date object to a specified value.

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

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

Create a function that returns the month of a Date object in UTC time zone.

Given a string, return a new string that is a substring of the original string. The substring should start at a specified index and continue until the end of the original string.

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

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

Create a function that receives a Date object and returns the milliseconds that have elapsed since the start of the day.

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

Given a date, return the UTC date.

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

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

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().

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

Create a function that takes a string as input and returns the same string in uppercase letters using the `toString()` method of the String object.

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

Converts a given date to a time string

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

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.

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 joins two arrays into a single string using Array.prototype.join() 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.

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

Implement a function that groups an array of objects by a given key and returns a new array of objects, where each object has a key and an array of objects that have that key.

Implement a function that takes in a Set and returns an array of entries

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

Write a function that takes a string and a substring, and returns the index of the first occurrence of the substring in the string. If the substring is not found in the string, return -1.

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')

Write a function that takes a string as input and splits it into an array of words using String.prototype.split(). Then, join the array back into a string using Array.prototype.join(). Finally, return the new string with a different delimiter separating each word.

Write a function that uses the String.prototype.trimStart() method to remove any whitespace characters from the beginning of a given string.

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

Implement a function that removes leading and trailing whitespace from a string using the String.prototype.trim() method.

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

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

Create a function that receives a string and normalizes it using the String.prototype.normalize() method. Apply the NFC normalization form.

Implement a function that replaces all instances of a specified substring in a given string.

Write a function that extracts a character from a string given an index using String.prototype.charAt()

Implement a function that returns true if a given string starts with a specific substring.

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

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

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

Write a function that takes a Set object as a parameter and returns an array of keys using Set.prototype.keys().

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 two strings as input and concatenates them using the String.prototype.concat() method.

Create a function that checks if a given string ends with a specified suffix.

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 uses Array.prototype.entries() to iterate over an array and perform some operations.

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

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

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

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

Implement a function that takes an array of strings and a search string, and returns a new array containing only the strings that includes the search string using String.prototype.includes() method.