Library

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

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

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

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

Create a function that takes an array and removes a portion of the array, as specified by the arguments, and returns the removed portion.

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 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 string as input and returns the string in all lowercase letters.

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

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

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

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

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 greets the user depending on the current hour of the day.

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

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().

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 a date object and a number representing the desired month, and sets the month of the date to the given month.

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

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

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

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

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

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

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

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

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 repeats a given string n times.

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

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

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

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.

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

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.

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

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.

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

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

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

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

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

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.

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

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

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

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 equations using the Array.of() method to create 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 takes a string and a regular expression and returns an array of all the substrings in the string that match the regular expression.

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

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

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

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 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.

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

Create a function that normalizes a string using String.prototype.normalize method.

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

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 string and a number, and repeats the string the given number of times.

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.

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

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

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

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

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

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

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

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 sets the UTC month of a given date object.

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

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

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

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

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.

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

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

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 in a date and returns the seconds within the minute in UTC time.

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

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

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

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