How to Implement For Loop Functionality in Go Templates?

For Loop Functionality in Templates

In Go templates, you may require a means to iterate over a range of values using a for loop. While the range and prepared array approach is effective, this article explores how to incorporate such functionality directly into the templates.

Using an External Function with Range

The simplest method involves utilizing range alongside an external function. Here's an example implementation:

<code class="go">func For(start, end int) <-chan int {
    c := make(chan int)
    go func() {
        for i := start; i < end; i++ {
            c <- i
        }
        close(c)
    }()
    return c
}</code>

Within the template, you can then do the following:

{{range For 0 10}}
i: {{.}}
{{end}}

This code will iterate through the integers from 0 to 9.

Remember, this is one of the possible approaches to achieve for loop functionality in Go templates. By utilizing an external function, you gain the flexibility to customize your iteration logic as needed.

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