Library

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

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

Implement normalize method to format a string removing all the accents

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

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

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

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

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

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

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

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

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

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

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 determines if two strings are anagrams of each other.

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

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

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

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 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.

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 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 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.

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

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

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

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

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

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

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

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

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

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

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

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 returns the date formatted in the user's local format using the toLocaleDateString() method.

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.

Converts a given date to a time string

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

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

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

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

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

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

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

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

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 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 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.

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

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

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

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

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 replaces all instances 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 takes in an array of music tracks and returns an object with the count of each genre in the array

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

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

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

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

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

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

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

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

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

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

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

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.

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

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, based on the start and end index provided

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

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

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

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

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

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.

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

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

Implement a function that takes a Date object as input and returns a formatted 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 uses recursion to calculate the factorial of a given positive integer.