Discuss why Golang does not have templates

In recent times, Golang has become more and more popular, and more and more people have begun to use Golang to develop various projects. However, some Golang developers may find that Golang does not provide template engine support like other languages, which also troubles some Golang developers. This article will discuss the reasons why Golang does not have templates and its solutions.

1. The reason why Golang does not have templates

Golang is a very concise language that pays more attention to the readability and maintainability of the code. The so-called template engine actually combines some dynamic content and static HTML to finally generate a complete HTML page. Compared with template engines in other languages, Golang prefers to use native HTML template syntax, which can not only ensure the simplicity and readability of the code, but also reduce dependence on third-party libraries.

2. How to use templates in Golang

Although Golang does not provide official templates, it provides an html/template package to handle related functions of HTML templates. When using the html/template package, we only need to render the data into the HTML template, and the html/template package will automatically handle issues such as HTML escaping and data formatting, thus avoiding some security issues and errors.

The following is a simple example that demonstrates how to use the html/template package to process a simple HTML template:

package main

import (
    "html/template"
    "os"
)

type User struct {
    Name string
    Age  int
}

func main() {
    user := User{"Gopher", 5}
    tmpl, err := template.New("test").Parse("<h1 id="Hello-Name">Hello {{.Name}}</h1><p>Age: {{.Age}}</p>")
    if err != nil {
        panic(err)
    }
    err = tmpl.Execute(os.Stdout, user)
    if err != nil {
        panic(err)
    }
}

The above code defines a User structure and uses the html/template package Render it to an HTML template and print the result to the console. The output is as follows:

<h1 id="Hello-Gopher">Hello Gopher</h1><p>Age: 5</p>

As you can see from the above code, using the html/template package to process HTML templates is very simple and easy to use, and it also avoids some security issues and errors.

3. Third-party template library

In addition to the html/template package, there are many other third-party template libraries, such as: pongo2, mustache, handlebars, etc. These libraries provide rich template syntax and also support advanced features such as template inheritance, partial templates, and dynamic templates. Using these libraries, you can handle a variety of different template needs more flexibly.

The following is a simple example that demonstrates how to use the pongo2 library to process a simple HTML template:

package main

import (
    "github.com/flosch/pongo2"
    "os"
)

type User struct {
    Name string
    Age  int
}

func main() {
    user := User{"Gopher", 5}
    tmpl, err := pongo2.FromString("{% extends 'base.html' %}{% block content %}<h1 id="Hello-user-Name">Hello {{user.Name}}</h1>{% endblock %}")
    if err != nil {
        panic(err)
    }
    ctx := pongo2.Context{"user": user}
    err = tmpl.ExecuteWriter(ctx, os.Stdout)
    if err != nil {
        panic(err)
    }
}

The above code defines a User structure and uses the pongo2 library to render it to In an HTML template, a complex HTML page is implemented through template inheritance and partial templates.

4. Summary

Although Golang does not provide official template engine support, we can also easily implement various templates by using the html/template package or a third-party template library. need. The html/template package is concise and easy to use, while also avoiding some security issues and errors. The third-party template library provides richer template syntax and advanced functions, which can handle various template requirements more flexibly.

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