Phase 1: Fundamentals

Implement a function that accepts an integer value and returns a function that can be repeatedly called to return increasing values

Implement a function that finds the mean of the values inside an array

Implement a function to clamp a number within the inclusive lower and upper bounds

Implement a function that pauses for a specified duration before resuming execution

Implement a function that accepts a callback and restricts its invocation to at most once

Implement a function that sums numbers by accepting a number and allows for repeated calling with more numbers until it is not called with any number

Implement the Function.prototype.call() function that calls the function with a given `this` value and provided arguments

Implement the Function.prototype.apply() function that calls the function with a given `this` value and arguments as an array

Implement the Function.prototype.bind() function that creates a new function with the `this` keyword set to a provided value

Implement a function that returns the number of parameters expected by a function

Implement a function that returns the number of arguments it was called with

Implement the Array.prototype.reduce() method

Implement the Array.prototype.filter() method

Implement the Array.prototype.map() method

Implement the Array.prototype.at() method

Implement the Array.prototype.concat() method

Implement a custom Array.prototype.square() method that squares the values in an array

Implement a function that creates an array of elements split into smaller groups of a specified size

Implement a function that creates an array with all falsey values removed

Implement a function that finds the difference in values between arrays

Implement a function that excludes elements from the end of an array until the predicate returns false

Implement a function that excludes elements from the beginning of an array until the predicate returns false

Implement a function that fills an array with values within specified indices

Implement a function that returns the index of the first element in the array that satisfies the provided testing function

Implement a function that returns the index of the last element in the array that satisfies the provided testing function

Implement a function that computes the intersection of arrays, returning a new array containing unique values present in all given arrays

Implement a function that returns a sequence of numbers in ascending order

Implement a function that returns a sequence of numbers in descending order

Implement a function to remove all duplicate values from an array

Implement utilities to determine primitive variable types in JavaScript

Implement utilities to determine non-primitive variable types in JavaScript

Implement a function that finds the minimum element based on the specified criteria

Implement a function that finds the maximum element based on the specified criteria

Implement a function that returns an object composed from key-value pairs

Implement a function to safely access deeply-nested properties in JavaScript objects

Implement a function to check if a number falls between two numbers

Implement a function to transform values within an object

Implement a function that returns the size of collection

Implement a hook that manages a boolean state, with additional convenience utility methods

Implement a hook that manages a counter state, with some additional convenience utility methods

Implement an optimized version of the useBoolean hook

Implement an optimized version of the useCounter hook

Implement a hook that returns the default value when state is null or undefined

Implement a hook that runs an effect only once

Implement a hook that enables programmatic focusing of an element

Implement a hook that returns the previous value of a state

Implement a hook that's similar to useState but with an additional reset function that resets the state to its initial value

Implement a hook that manages a boolean toggle state

Implement a hook that cycles through a sequence of values

Implement a function that takes one or more values and returns a function that cycles through those values each time it is called

Implement a function that acts like setInterval but returns a function to cancel the interval

Implement a function that acts like setTimeout but returns a function to cancel the pending callback

Implement a function that takes multiple functions as arguments and returns a new function that applies those functions in reverse

Implement a Singleton class that ensures a class has only one instance while providing a global point of access to that instance

Implement a function to return a Promise object rejected with a reason

Implement the Promise.race() function that resolves or rejects when any of the input elements are resolved or rejected