How can I iterate through a map in a Go template?

Iterating Through a Map in a Template

In your code, you have created a function, groupClasses, that converts a slice of classes into a map, where the keys are class types (e.g., "Yoga", "Pilates") and the values are slices of classes of that type.

To iterate through this map in your template, you can use the range keyword with two variables, as explained in the Variables section of the Go template documentation. Here's an example:

{{ range $classType, $classes := . }}
    <li><strong>{{ $classType }}</strong>: {{ range $class := $classes }} {{ $class.Name }} {{ end }}</li>
{{ end }}

This template will iterate through the map, assigning the class type to the variable $classType and the slice of classes to the variable $classes for each iteration. Within the loop, it lists the classes for each class type.

By using two variables, you can access both the key and the value of the map item during the iteration. This allows you to display the data in a meaningful way in your template.

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