Application of Golang functions in single-page application development

Go functions bring advantages to single page application (SPA) development, including reusable code blocks and code organization. Creating a Go function requires using the func keyword, and applying it to a SPA involves compiling into a Wasm module, loading into JavaScript, and calling the function. The practical case shows the use of Go functions to calculate the total price of the shopping cart. Go для создания высокопроизводительн SPA.

Go functions in single page application development Application

Introduction

Go is a powerful language that is ideal for developing Single Page Applications (SPA) as it provides excellent concurrency, high Performance and simple syntax. Go functions are a powerful tool for SPA development, allowing you to create reusable chunks of code and organize your code.

Creating a Go function

To create a Go function, use the following syntax:

func functionName(parameters) returnType {
    // 函数体
}

For example, we create a function that calculates the sum of two numbers :

func add(a, b int) int {
    return a + b
}

Using functions in SPA

In SPA, you can use Go functions in JavaScript files. To do this, we need to use the WebAssembly (Wasm) module generated by Go:

1. Compile the Go function into Wasm: go build -o add.wasm ./add.go
2. Load the Wasm module in JavaScript: const add = await WebAssembly.instantiate(await fetch("./add.wasm"))
3. Call the Go function: const result = add.exports.add(10, 20)

#Practical case: Calculate the total price of the shopping cart

We will now build a Simple SPA example using Go function to calculate shopping cart total price.

Go code:

package main

import "strconv"

// getItemPrice 返回项目的价格
func getItemPrice(id string) int {
    // 通过 ID 获取价格（模拟数据库查询）
    return 10
}

// calcTotalPrice 返回购物车的总价
func calcTotalPrice(items []string) int {
    total := 0
    for _, item := range items {
        price, _ := strconv.Atoi(item)
        total += getItemPrice(item)
    }
    return total
}

JavaScript code:

// 加载 Wasm 模块
const calcTotalPrice = await WebAssembly.instantiate(await fetch("./calcTotalPrice.wasm"));

// 获取购物车物品 ID
const items = ["item1", "item2", "item3"];

// 调用 Go 函数计算总价
const totalPrice = calcTotalPrice.exports.calcTotalPrice(items);

Conclusion

Go functions provide enhanced capabilities for SPA development by providing reusable code blocks and the ability to organize code. By using Go functions with Wasm, we can create single-page applications that are performant, concurrent, and easy to maintain.

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