Library

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

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

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

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

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

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

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

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.

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 it in lowercase using the toLocaleLowerCase() method.

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.

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

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

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

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

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 variable is an array. If it is an array, return true, otherwise return false.

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.

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

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

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.

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

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

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

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

Implement normalize method to format a string removing all the accents

Implement a function that groups an array of objects by a given key and returns a new array of objects, where each object has a key and an array of objects that have that key.

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

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

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

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

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

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

Write a function that replaces the first occurrence of a specific string in a given 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 various functionalities using Array.prototype.slice() method

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

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

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

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 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 returns the nth number in the Fibonacci sequence using recursion.

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

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.

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

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

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

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

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

Write a function that converts a given string to uppercase

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

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

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

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

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 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.

Given a date, return the UTC date.

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

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

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.

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

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

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

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

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

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

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

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 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.

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

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

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 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 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.

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 replaces all instances of a given substring with another string within a larger string using String.prototype.replaceAll() method.

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

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

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

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

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

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

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

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

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

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