高朗由计算机科学界的重量级人物设计,用于解决实际问题。

高朗是一种优化语言,Uber和Google使用它进行映射,而Netflix使用它进行流式处理。

从另一个包解引用指针

本示例旨在演示指针的声明和访问指针所指向的变量的值。

Go中没有Struct的动态XML解析器

xmlquery是用于XML文档的XPath查询包,可让您通过XPath表达式从XML文档提取数据或求值。 It is hosted on GitHub, along with additional documentation in the README.md file: //github.com/antchfx/xmlquery

高朗中没有Struct的动态JSON解析器

Gabs is a small utility for dealing with dynamic or unknown JSON structures in Go. It does not require you to know the structure of the payload (eg. create structs), and allows accessing fields by providing the path to them. It's pretty much just a helpful wrapper for navigating hierarchies of map[string]interface{} objects provided by the encoding/json package. It does nothing spectacular apart from being fabulous. Source Code

如何使用另一个文件golang中的功能?

This example aims to demonstrate the various calls of a function in detail. You will learn to create and call a custom package function in main package. You will also be able to call functions of custom packages from the another package using alias.

高朗导入包内包

This example aims to demonstrate the implementation of interfaces in Go and import your custom package. You will be able to define and declare an interface for an application in custom packages and implement that interface in your applications.

如何从Go中的另一个包中导入结构?

You will learn to create your own package and import your custom package. In this example, you will see how to import structure from another or child package. You will also be able to call functions of custom packages from the main package.

HTML解析器组

包goquery实现了与jQuery类似的功能,包括可链接的语法,以操纵和查询HTML文档。 It brings a syntax and a set of features similar to jQuery to the Go language. It is based on Go's net/html package and the CSS Selector library cascadia. Syntax-wise, it is as close as possible to jQuery, with the same method names when possible, and that warm and fuzzy chainable interface. It is hosted on GitHub, along with additional documentation in the README.md file: //github.com/puerkitobio/goquery

什么是GOPATH?

GOPATH is actually just an environment variable which shows a location to a physical directory on computer. By default, Go assumes that the folder that GOPATH shows is under user's folder. And in that case there won't be an environment variable for GOPATH. So you don't need to set it, it's automatic.

如何使用互斥锁定义代码的关键部分并解决竞争条件?

互斥锁用于在代码周围创建关键部分,以确保一次只能有一个goroutine可以执行该代码部分。

如何在Golang中使用原子函数解决竞争条件?

争用条件是由于对共享资源的不同步访问而引起的,并试图同时读取和写入该资源。 Atomic functions provide low-level locking mechanisms for synchronizing access to integers and pointers. Atomic functions generally used to fix the race condition. 同步包下的atomic中的函数通过锁定对共享资源的访问来提供支持同步goroutine的支持。

如何播放和暂停执行goroutine?

Using channels we can play and pause execution of goroutine. A channel handles this communication by acting as a conduit between goroutines.

如何杀死goroutine的执行?

A channel has a close operation that closes the channel so that a send operation on the channel cannot take place. A send operation on a closed channel will result in a panic. When a receive operation is performed on the channel, we check if the channel is closed or not, and exit from the goroutine if the channel is closed.

从Goroutines捕获值

The most natural way to fetch a value from a goroutine is channels. 频道 are the pipes that connect concurrent goroutines. You can send values into channels from one goroutine and receive those values into another goroutine or in a synchronous function.

如何等待Goroutine完成执行?

The WaitGroup type of sync package, is used to wait for the program to finish all goroutines launched from the main function. It uses a counter that specifies the number of goroutines, and Wait blocks the execution of the program until the WaitGroup counter is zero. Add方法用于将计数器添加到WaitGroup。 使用defer语句调度WaitGroup的Done方法,以减少WaitGroup计数器。 WaitGroup类型的Wait方法等待程序完成所有goroutine。 The Wait method is called inside the main function, which blocks execution until the WaitGroup counter reaches the value of zero and ensures that all goroutines are executed.

用户在Golang中定义的函数类型

高朗还支持定义我们自己的函数类型。 上面程序的修改版本,其功能类型如下:

高朗中的高阶函数

高阶函数是接收函数作为参数或返回函数作为输出的函数。 高阶函数是可以通过将其他函数作为参数或通过将其返回来对其他函数进行操作的函数。 将函数作为参数传递给其他函数

高朗中的闭包函数

Closures are a special case of anonymous functions. Closures are anonymous functions which access the variables defined outside the body of the function.

高朗中的匿名函数

An anonymous function is a function that was declared without any named identifier to refer to it. Anonymous functions can accept inputs and return outputs, just as standard functions do.

高朗函数返回多个值

高朗中的函数可以返回多个值,这在许多实际情况下都是很有帮助的功能。 本示例声明一个具有两个返回值的函数,然后从主函数调用它。

在Golang中创建函数

A declaration begins with the func keyword, followed by the name you want the function to have, a pair of parentheses (), and then a block containing the function's code. 下面的示例具有一个名为SimpleFunction的函数。它不带参数,也不返回值。

如何在Go中创建照片库?

Photo gallery is a way of displaying the different images that are saved at a specific location. Here the different images are uploaded by user in a specified folder. For displaying the images first of all we need to read the directory containing the different images, and there after reading display the images one by one.

在Golang中创建和打印多维切片

This is a multidimensional in slice that stores inner in slices. So each element of the slice is another in slice. This is a short declaration of a multidimensional slice.

如何在字符串中写反斜杠?

To print backslash, just need to type the backslash twice. Hence, Go interpreter treat it as a single backslash character instead of escape sequence character.