How Can I Iterate Over a Go Array Within a Javascript For-Loop?

Referencing Go Array in Javascript

When leveraging Go arrays within Javascript, understanding the distinct environments of template actions and Javascript execution is crucial.

The Challenge:

You aim to iterate over a Go array in Javascript using a for-loop, attempting to access elements via {{index .Array i}}. However, this approach encounters a syntactical error.

The Dilemma:

Template actions like {{index .Array i}} are executed server-side in Go, while Javascript code operates client-side in the browser. These environments are inherently separate, so mixing their syntax creates a syntax error.

The Solution:

Resolve this issue by employing one of these options:

Option 1: Execute Template Actions:

Utilize template actions to process the array fully, such as:

{{range .Array}}
    {{.}}
{{end}}

Option 2: Generate Javascript Code

Use the template to generate Javascript code that will recreate the array client-side, enabling Javascript processing. Example:

<script>
    var arr = [
        {{range .Array}}
            {{.}},
        {{end}}
    ];
</script>

As a simpler alternative, you can directly render the array inJavascript syntax, e.g.:

<script>
    var arr = {{.Array}};
</script>

Note:

For a single pass over the array, a Javascript array is unnecessary. Instead, renderJavascript code that forms the loop body within a template action, such as:

{{range .Array}}
    <js_code_to_add_to_arr>
{{end}}

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