How to generate random numbers in Golang lambda function?

To generate random numbers in a Go lambda function, you need to use the math/rand library: import the library and set the seed to ensure different outputs. Use rand.Intn(max) to generate a random integer (range [0,max)). Use rand.Float64() to generate a random decimal (range [0.0,1.0)). Use rand.ReadStringN(n) to generate a random string (of length n).

#How to generate random numbers in Golang lambda function?

The Golang language has a built-in powerful random number generation library math/rand. Using this library we can easily generate random numbers in lambda functions.

Installation and setup

First, import the math/rand library:

import (
    "math/rand"
    "time"
)

time.Now() The .UnixNano() part is used to generate the seed, ensuring a different output each time a random number is generated.

Generate a random integer

You can use the rand.Intn(max) function to generate a random integer between [0, max) A random integer in the range, where max specifies the upper limit.

max := 10
num := rand.Intn(max)
fmt.Println(num) // 输出一个介于 [0, 10) 范围内的随机整数

Generate a random decimal

You can use the rand.Float64() function to generate a random decimal number between [0.0, 1.0) Random decimal number within the range.

num := rand.Float64()
fmt.Println(num) // 输出一个介于 [0.0, 1.0) 范围内的随机小数

Generate a random string

You can use the rand.ReadStringN(n) function to generate a length of n Random string.

length := 10
str := make([]byte, length)
rand.ReadStringN(len(str), str)
fmt.Println(string(str)) // 输出一个 10 个字符长的随机字符串

Practical case

The following is a simple example of using the math/rand library to generate random numbers in a Golang lambda function:

package main

import (
    "context"
    "encoding/json"
    "fmt"
    "log"
    "math/rand"
    "time"

    "github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, req []byte) (int, error) {
    rand.Seed(time.Now().UnixNano())
    return rand.Intn(10), nil
}

func main() {
    lambda.Start(handler)
}

This lambda function will generate a random integer in the range [0, 10) and output it to the function log.

The above is the detailed content of How to generate random numbers in Golang lambda function?. For more information, please follow other related articles on the PHP Chinese website!