How Do I Iterate Through a Map in a Go Template?

Iterating through a Map in a Go Template

When working with maps in Go templates, it's essential to understand how to iterate over their elements.

func groupClasses(classes []entities.Class) map[string][]entities.Class {
    classMap := make(map[string][]entities.Class)
    for _, class := range classes {
        classMap[class.ClassType.Name] = append(classMap[class.ClassType.Name], class)
    }
    return classMap
}

To iterate through the classMap generated by the groupClasses function in a template, follow these steps:

1. Understand Key-Value Variables: In Go templates, range iterations can declare multiple variables separated by commas.

2. Range Iteration: To iterate through a map, use the following syntax:

   {{ range $key, $value := . }}
   

where:

• $key represents the map key (e.g., the class type name)
• $value represents the map value (e.g., the slice of classes for that type)

3. Access Elements: Within the range block, you can access the key and value using the $key and $value variables.

For example, to list out all class types and their corresponding classes:

{{ range $key, $value := . }}
   

{{ $key }}: {{ $value }}

{{ end }}

This will generate HTML like:

Yoga: [Yoga class 1, Yoga class 2, ...]

Pilates: [Pilates class 1, Pilates class 2, ...]

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