Library

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

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

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

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

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

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

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

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

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

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

Create a function that slices a string based on a given start and end indexes

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

Create a function that returns the current minutes.

Given an array of numbers, use reduce method to obtain a single value that represents the sum of all numbers in the array.

Write a function that takes a Date object and returns the date formatted in the user's local format using the toLocaleDateString() method.

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

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

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

Create a function that takes a date and a year and sets the date's UTC full year to the provided year.

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

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().

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

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.

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

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

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.

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

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

Write a function that takes a Date object and returns a string representing the time portion of the date in the current time zone using the toLocaleTimeString() method. The function should also take an optional argument specifying the locale to use.

Write a function that can take in a list of numbers and precision cut them to a desired number of decimal places.

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.

Write a JavaScript function to find the index of an item in an array using Array.prototype.findIndex().

Fill arrays with specific values using Array.prototype.fill()

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

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.

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

Create a function that takes in a string and uses String.prototype.match() to find all occurrences of a pattern within the string.

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

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

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

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

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

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

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.

Implement various functionalities using Array.prototype.slice() method

Write a function that returns the result of a string match with a given pattern.

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

Create a function that returns the current date as a number (1-31).

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

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

Write a function that takes an array and a value as arguments and returns the index of the last occurrence of that value in the array using Array.prototype.lastIndexOf(). If the value is not found, return -1.

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

Create a function that takes two parameters: a string and a target substring, and returns the index of the first occurrence of the target substring in the string. If the target substring is not found, return -1.

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.

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 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.

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

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

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

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.

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

Create a function that takes in a string and checks if it starts with a given substring. Return a boolean indicating whether or not the string starts with the given substring.

Given a sentence, split it into an array of words using the String.prototype.split() 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 a function that adds a value to a set using Set.prototype.add().

Implement a function that takes a string as input and returns it in lower case.

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

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 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.

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

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

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.

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

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

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

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

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 a target substring, and returns the index at which the target substring is first found. If the target substring is not found in the string, return -1. Use the built-in JavaScript method `indexOf()` to solve the problem.

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

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.

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 normalizes a string using String.prototype.normalize().

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.

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

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

Write a function that takes a string and a search term and returns the index of the first occurrence of the search term in the given string. If the search term is not present in the string, return -1.

Use Array.prototype.slice() to solve the following tasks.

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

Create a function that takes two strings as input and concatenates them using the String.prototype.concat() method.

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 Date object and returns a JSON string of the date in ISO format.

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

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