Book Image

Go Standard Library Cookbook

By : Radomír Sohlich
Book Image

Go Standard Library Cookbook

By: Radomír Sohlich

Overview of this book

Google's Golang will be the next talk of the town, with amazing features and a powerful library. This book will gear you up for using golang by taking you through recipes that will teach you how to leverage the standard library to implement a particular solution. This will enable Go developers to take advantage of using a rock-solid standard library instead of third-party frameworks. The book begins by exploring the functionalities available for interaction between the environment and the operating system. We will explore common string operations, date/time manipulations, and numerical problems. We'll then move on to working with the database, accessing the filesystem, and performing I/O operations. From a networking perspective, we will touch on client and server-side solutions. The basics of concurrency are also covered, before we wrap up with a few tips and tricks. By the end of the book, you will have a good overview of the features of the Golang standard library and what you can achieve with them. Ultimately, you will be proficient in implementing solutions with powerful standard libraries.
Table of Contents (13 chapters)

Generating random numbers

This recipe shows how to generate random numbers. This functionality is provided by the math/rand package. The random numbers generated by math/rand are considered cryptographically insecure because the sequences are repeatable with given seed.

To generate cryptographically secure numbers, the crypto/rand package should be used. These sequences are not repeatable.

How to do it...

  1. Open the console and create the folder chapter03/recipe08.
  2. Navigate to the directory.
  3. Create the rand.go file with the following content:
        package main

import (
crypto "crypto/rand"
"fmt"
"math/big"
"math/rand"
)

func...