Library

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

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

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

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

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

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

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 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.

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

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

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 string and returns an array of code points for each character in the string using String.prototype.codePointAt() method.

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

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

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

Write a function that takes a string and removes any trailing whitespace at the end of it using String.prototype.trimEnd().

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

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.

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 string as input and converts it to a UTC date string format.

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 normalize method to format a string removing all the accents

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

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

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

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().

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

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

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

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

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

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

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.

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

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

This kata focuses on using String.prototype.indexOf() method.

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 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 whether a given string ends with the provided suffix or not

Converts a given date to a time string

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

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

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

Create a function that returns the current minutes.

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

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

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

Create a function that transforms a given string to uppercase, using String.prototype.toLocaleUpperCase()

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.

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 an array and reverse its order in place.

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 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 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.

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

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.

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

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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 sorts an array of strings in alphabetical order using String.prototype.localeCompare()

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

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 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.

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

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

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

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

Implement a function that removes all unused items in a Set collection

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

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

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.