How to Format Floats in GoLang HTML/Template?

Formatting Floats in GoLang HTML/Template

In Go, you can format numeric values, such as float64, to specific decimal places using the strconv.FormatFloat function. However, when working with HTML templates, you may need to perform this formatting within the template itself.

Here are several options for formatting floats in GoLang HTML/Template:

1. Pre-Formatting the Number:
   You can format the number in your .go file before passing it to the template. For example:

   // In your `.go` file
   value := 3.1415
   formattedValue := strconv.FormatFloat(value, 'f', 2, 32)

2. Create a Custom Type:
   Create a custom type that implements the String() method, which formats the value to your desired format. For instance:

   type MyFloat float64
   func (mf MyFloat) String() string {
       return fmt.Sprintf("%.2f", float64(mf))
   }

3. Directly Call printf:
   You can call the printf function directly from the template and specify a custom format string. Example:

   {{printf "%.2f" myVariable}}

4. Register a Custom Function:
   To simplify direct printf calls, you can register a custom function that applies a predefined format. For instance:

   // Register the function in your template
   {{template "myFunction" .}}
   
   // Define the function in your `.go` file
   func myFunction(f float64) string {
       return fmt.Sprintf("%.2f", f)
   }

By employing these techniques, you can efficiently format floats in your GoLang HTML/Template files, allowing for more precise and readable numerical representations.

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