Library

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 uses the copyWithin method to replace specified elements within an array.

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

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

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

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 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.

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

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

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

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

Converts a given date to a time string

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

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

Implement normalize method to format a string removing all the accents

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.

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.

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 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().

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

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 string and regular expression as inputs, and returns an array of all matches found using the String.matchAll() method.

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

Create a function that greets the user depending on the current hour of the day.

Write a function that returns the value of a given string using the String.prototype.valueOf() 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 returns the month of a Date object in UTC time zone.

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

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.

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

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

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 an algorithm that manages the overbooking of an airline flight.

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

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

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

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

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

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

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

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

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

Given a date, return the UTC date.

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

Create a function that repeats a given string n times.

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

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

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

Create a program that classifies music genres based on certain audio features

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

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

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

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

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

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

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

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

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

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 returns an array of char codes from a string

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.

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

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

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

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()

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.

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

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

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

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.

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.

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

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

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.

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

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

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

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.

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

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 minutes.

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

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