> For the complete documentation index, see [llms.txt](https://ineelhere.gitbook.io/code-with-go/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ineelhere.gitbook.io/code-with-go/50-text-templates.md).

# Text Templates

This Go code demonstrates the use of the `text/template` package to define and execute templates. Let's go through the code with inline comments and explanations:

```go
// Importing necessary packages.
import (
	"os"
	"text/template"
)

// The main function, where the execution of the program begins.
func main() {
	// Creating a new template named "t1" and parsing a simple template string.
	t1 := template.New("t1")
	t1, err := t1.Parse("Value is {{.}}\n")
	if err != nil {
		panic(err)
	}

	// Using template.Must to simplify error handling and parsing another template string.
	t1 = template.Must(t1.Parse("Value: {{.}}\n"))

	// Executing the template with different values and printing the result to os.Stdout.
	t1.Execute(os.Stdout, "some text")
	t1.Execute(os.Stdout, 5)
	t1.Execute(os.Stdout, []string{
		"Go",
		"Rust",
		"C++",
		"C#",
	})

	// Creating a function to simplify template creation.
	Create := func(name, t string) *template.Template {
		return template.Must(template.New(name).Parse(t))
	}

	// Creating a new template "t2" using the Create function and executing it with a struct and a map.
	t2 := Create("t2", "Name: {{.Name}}\n")
	t2.Execute(os.Stdout, struct {
		Name string
	}{"Jane Doe"})

	t2.Execute(os.Stdout, map[string]string{
		"Name": "Mickey Mouse",
	})

	// Creating a new template "t3" using the Create function with a conditional statement and executing it.
	t3 := Create("t3", "{{if . -}} yes {{else -}} no {{end}}\n")
	t3.Execute(os.Stdout, "not empty")
	t3.Execute(os.Stdout, "")

	// Creating a new template "t4" using the Create function with a range statement and executing it.
	t4 := Create("t4", "Range: {{range .}}{{.}} {{end}}\n")
	t4.Execute(os.Stdout,
		[]string{
			"Go",
			"Rust",
			"C++",
			"C#",
		})
}
```

#### Output

```
Value: some text
Value: 5
Value: [Go Rust C++ C#]
Name: Jane Doe
Name: Mickey Mouse
yes 
no 
Range: Go Rust C++ C# 
```

Explanation:

1. **Creating and Parsing Templates:**
   * `t1` is created with `template.New("t1")` and parsed with `t1.Parse("Value is {{.}}\n")`.
   * `template.Must` is used to simplify error handling and parse another template string.
2. **Executing Templates:**
   * The `Execute` function is used to execute templates with different values, printing the results to `os.Stdout`.
3. **Template Creation Function:**
   * The `Create` function is defined to simplify template creation using `template.Must`.
4. **Using Struct and Map:**
   * `t2` is created using the `Create` function, and it is executed with both a struct and a map as input.
5. **Conditional Statement in Template:**
   * `t3` is created using the `Create` function with a conditional statement (`{{if . -}} yes {{else -}} no {{end}}`).
6. **Range Statement in Template:**
   * `t4` is created using the `Create` function with a range statement (`{{range .}}{{.}} {{end}}`), and it is executed with a slice of strings.

These examples showcase the flexibility of the `text/template` package for defining and executing templates with various data structures and control structures.


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