Science Knowings: JavaScript Course For Social Media

Functors

Functors: The Functor Functor (What Are Functors?)

In this session, we'll dive into Functors in JavaScript, a concept that unlocks powerful transformations in functional programming.

Functors: The Functor Functor (Functor Laws and Implementation)

Functors obey specific laws (identity and composition) that ensure consistent behavior. We'll explore these laws and their implementation.

Functors: The Functor Functor (Identity and Composition Laws)

The identity law states that mapping the identity function should return the original value, while the composition law ensures that mapping nested functions produces the expected result.

Functors: The Functor Functor (Contramap)

Contramap allows us to transform the input of a function before applying it to the value within the Functor. This enables powerful composition of functions.

Functors: The Functor Functor (Lift)

Lift promotes a function to work within a Functor, allowing us to operate on values in a structured way.

Functors: The Functor Functor (Map)

Map transforms each element in a Functor using a provided function, creating a new Functor with the transformed values.

Functors: The Functor Functor (Chain)

Chain combines two Functors, applying a function to the inner value of the first Functor and then mapping the result to the second Functor.

Functors: The Functor Functor (Array.map

Array.map is a common example of a Functor method, allowing us to transform each element in an array.

Functors: The Functor Functor (Array.of)

Array.of wraps a value in an array, creating a new instance of the Functor.

Functors: The Functor Functor (Array.chain)

Array.chain combines arrays using the chain method, applying a function to each element and flattening the result.

Functors: The Functor Functor (Option.map)

Option.map transforms the value within an Option Functor using a provided function, if the Option is Some.

Functors: The Functor Functor (Option.of)

Option.of wraps a value in an Option Functor, creating a new instance of the Functor.

Functors: The Functor Functor (Option.chain)

Option.chain combines two Option Functors using the chain method, applying a function to the inner value if the Option is Some and returning a new Option.

Functors: The Functor Functor (Either.of)

Either.of wraps a value in an Either Functor, creating a new instance of the Functor.

Functors: The Functor Functor (Either.map)

Either.map transforms the value within an Either Functor using a provided function, if the Either is Right.

Functors: The Functor Functor (Either.chain)

Either.chain combines two Either Functors using the chain method, applying a function to the inner value if the Either is Right and returning a new Either.

Functors: The Functor Functor (Summary)

Functors provide a powerful and structured way to transform values. They enable us to compose functions, lift functions, and chain operations in a consistent and predictable manner.

Next Topic: Applicatives

In the next session, we'll explore Applicatives, a generalization of Functors that enables us to apply functions to values within Functors. Follow us to learn more!