How to use Go language to write the delivery cost calculation module in the door-to-door cooking system?

How to use Go language to write the delivery cost calculation module in the door-to-door cooking system?

With the booming development of the takeout industry, more and more catering companies have begun to provide door-to-door cooking services. In this service model, users can choose their favorite dishes, and then the chef will come to cook them for them. However, in addition to the price of the dishes, delivery costs are also an important factor. Therefore, it is necessary to design a module that can automatically calculate delivery costs. This article will introduce how to write this module using Go language and provide specific code examples.

⼼1. Design Idea

In the door-to-door cooking system, the calculation of delivery costs is usually based on some rules and conditions. Based on the restaurant's own location and the user's location, delivery costs are calculated through a certain algorithm. This algorithm can include some fixed rules and dynamic factors. The following is a simple design idea:

1. Get the location of the restaurant and the location of the user. This can be achieved by calling the geographical location interface, such as Amap API.
2. Calculate the distance between the restaurant and the user. This can be achieved using the distance calculation function provided by the Amap API.
3. Calculate delivery costs based on distance and other factors. Different rates can be set based on distance and take into account other factors such as the size of the restaurant, the user's order amount, etc.
4. Return the calculation result. Returns the calculated shipping cost to the caller.

⼼2. Code implementation

The following is a code example using Go language to implement the above design ideas:

package main

import (

"fmt"
"math/rand"
"time"

)

// Get the location of the restaurant and user, here use random numbers to simulate
func getLocation() (float64, float64) {

restaurantLat := 31.12345 + rand.Float64()*0.05
restaurantLng := 121.54321 + rand.Float64()*0.05
userLat := 31.23456 + rand.Float64()*0.02
userLng := 121.65432 + rand.Float64()*0.02
return restaurantLat, restaurantLng, userLat, userLng

}

// Calculate the distance between two points, a simplified calculation method is used here
func distance(restaurantLat, restaurantLng, userLat, userLng float64) float64 {

return (userLat-restaurantLat)*(userLat-restaurantLat) + (userLng-restaurantLng)*(userLng-restaurantLng)

}

// Calculate delivery fee
func calculateDeliveryFee(restaurantLat, restaurantLng, userLat, userLng float64) float64 {

dist := distance(restaurantLat, restaurantLng, userLat, userLng)
// 根据距离设置不同的费率，这里仅作为示例，实际项目中应该有更复杂的算法
if dist <= 0.0001 {
    return 5.0
} else if dist <= 0.0002 {
    return 7.0
} else {
    return 10.0
}

}

func main() {

// 设置随机数种子
rand.Seed(time.Now().UnixNano())

// 获取餐厅和用户的位置
restaurantLat, restaurantLng, userLat, userLng := getLocation()

// 计算配送费用
deliveryFee := calculateDeliveryFee(restaurantLat, restaurantLng, userLat, userLng)

// 打印结果
fmt.Printf("餐厅位置：(%f, %f)

", restaurantLat, restaurantLng)

fmt.Printf("用户位置：(%f, %f)

", userLat, userLng)

fmt.Printf("配送费用：%.2f 元

", deliveryFee)
}

In the above code, we call rand.Float64( ) function simulates obtaining the location of the restaurant and the user, and uses the distance() function to calculate the distance between the two points. Then, use the calculateDeliveryFee() function to calculate the delivery fee based on the distance. Finally, print out the result.

3. Summary

This article introduces how to use the Go language to write the delivery cost calculation module in the door-to-door cooking system. We obtain the locations of the restaurant and the user, calculate the distance between the two points, and then calculate the cost based on a certain Algorithm calculates delivery costs. The design of this module can be expanded and optimized according to actual needs.

By reading this article, you can learn how to use Go language to write a delivery cost calculation module, and understand the behind-the-scenes Design ideas. I hope this will be helpful to you when developing a door-to-door cooking system!

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