Library

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

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

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

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

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

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

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

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

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 returns the current month from Date object using Date.prototype.getMonth()

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.

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

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

Given a date, return the UTC date.

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

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

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

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

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.

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.

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

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

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.

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

Write a function that takes an integer n and returns the nth Fibonacci number using recursion.

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

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

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

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.

Create a function that takes in an array of music tracks and returns an object with the count of each genre in the array

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

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.

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

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

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

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

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 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 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')

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 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.

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 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 an array as input and returns an array of the keys of the given array using Array.prototype.keys() method.

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

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.

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

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

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.

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

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

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

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.

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

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

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

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.

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

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.

Write a function that takes two arrays as arguments and concatenates them into a new array using the Array.prototype.concat() method.

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

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.

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

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

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

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

Create a function that sets the UTC month of 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.

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

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

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.

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

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

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

Given a sentence, split it into an array of words using the String.prototype.split() method.

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

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

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

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

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

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

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

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

Create a function that repeats a given string n times.

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

Create a function to search for a substring in a given string using String.prototype.search() 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.

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

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 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.

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

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