How to Access the Name Field of the First Array Element in Go Templates?

Accessing the .Name Field of the First Array Element in Go Templates

In HTML templates, you may face situations where you need to access the value of the first index of an array. However, simply using the "index" function may not suffice, especially when trying to obtain specific fields within the array.

To address this challenge, the correct syntax involves grouping the expression and applying the ".Name" selector to retrieve the desired value. Consider the following template:

<div>Foobar {{ (index .Doc.Users 0).Name }}</div>

In this template, the ".Doc.Users" array contains objects with a "Name" field. By grouping the "index .Doc.Users 0" expression and applying ".Name," you effectively select the "Name" field of the first array element.

For a practical example, imagine you have an object with an array of users:

import "fmt"
import "os"
import "text/template"

type User struct {
    Name  string
    Email string
}

func main() {
    t := template.Must(template.New("").Parse(
        `<div>Foobar {{ (index .Doc.Users 0).Name }}</div>`))

    m := map[string]interface{}{
        "Doc": map[string]interface{}{
            "Users": []User{
                {Name: "Bob", Email: "[email protected]"},
                {Name: "Alice", Email: "[email protected]"},
            },
        },
    }

    fmt.Println(t.Execute(os.Stdout, m))
}

When you run this code on the Go Playground, you will obtain the following output:

<div>Foobar Bob</div>

This demonstrates the effective retrieval of the ".Name" field from the first element of the ".Doc.Users" array within your Go template.

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