Detailed explanation of curried function in Vue3: application of better functional programming methods

Detailed explanation of the curried function in Vue3: Better application of functional programming

Functional programming has always been a programming paradigm that has attracted much attention in the programming world. It uses an abstract , programming in a mathematical way, focusing on the mapping relationship between input and output during function execution, rather than focusing on the status and behavior of the object like traditional object-oriented programming.

Among the new features of Vue3, the application of curried functions provides better support for functional programming, allowing developers to practice this programming paradigm more conveniently.

So, what is the curried function?

The curried function, that is, the curried function, refers to changing a function that originally processed multiple parameters into a series of functions that only accept a single parameter (or some partial parameters), and returns another new function. technology.

This method of replacing functions with multiple parameters into a series of unit functions makes the combination and reuse of functions easier and can provide a lot of convenience for our code optimization.

The curried function in Vue3 is implemented using function closures, returning a new anonymous function. Each call can return a new function, allowing us to implement certain types of functions more conveniently. Function composition.

Below, we will use a few simple cases to learn more about the application of the curried function in Vue3 in functional programming.

Case 1: Currying of functions

Let’s look at a simple example first. The following is a function that finds the sum of two numbers:

function sum(a, b) {
  return a + b;
}

sum(1, 2) // 3

Now, we Use the curried function in Vue3 to curry it:

import { curry } from 'vue'

const sum = curry((a, b) => a + b)

sum(1)(2) // 3

As you can see, after using the curried function, we only need to pass in the first parameter to return a new Function, this new function only receives one parameter and returns a result, finally realizing the currying of the function.

Case 2: Function composition

Function composition is an important feature in functional programming. It refers to combining multiple functions into one function to simplify code and enhance Code readability and maintainability.

In the curried function of Vue3, we can use the compose function to achieve function composition.

import { compose } from 'vue'

const add = n => n + n
const multiply = n => n * 2

const addAndMultiply = compose(multiply, add)

addAndMultiply(3) // 12

We pass the two functions into the compose function to generate a new function. This function will first add the parameters, and then The result is multiply operated, and finally the processing result is returned.

Case 3: Adjusting the order of function parameters

The curried function can not only complete the currying and compounding of functions, but can also be used to adjust the order of function parameters.

For example, now we have a function that adds the three numbers a, b and c:

function sum(a, b, c) {
  return a + b + c
}

sum(1, 2, 3) // 6

We can use the flip function in Vue3 to adjust the parameters The order:

import { flip } from 'vue'

const sum = (a, b, c) => a + b + c
const flippedSum = flip(sum)

flippedSum(1, 2, 3) // 6
flippedSum(3, 2, 1) // 6

After using the flip function, we flipped the order of the parameters, making the function more convenient to use.

Summary:

The introduction of the curried function in Vue3 provides us with a better functional programming method, making functions such as currying, compounding, and parameter order adjustment more convenient Easy and efficient. As one of the new features of Vue3, the curried function can meet the needs of functional programming in different scenarios and improve the readability and maintainability of the code. It is one of the technical points that developers must know.

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