Question:
In Go templates, is there an efficient way to concatenate strings using operators like " "?
Examples Provided:
<code class="go">{{ $var := printf "%s%s" "x" "y" }} {{ TestFunc $var }} // Returns "xy" {{ $var := "y" }} {{ TestFunc "x" + $var }} // Error: unexpected "+" in operand {{ $var := "y" }} {{ TestFunc "x" + {$var} }} // Error: unexpected "+" in operand</code>
Answer:
Go templates do not support operators for string concatenation. Hence, the above examples will result in errors.
Solutions:
Use the printf Function:
As demonstrated in the first example, you can use the printf function to concatenate strings. This method is efficient and flexible.
<code class="go">{{ $var := printf "%s%s" "x" "y" }} {{ TestFunc $var }} // Returns "xy"</code>
Combine Template Expressions:
You can also combine multiple template expressions to achieve concatenation.
<code class="go">{{ TestFunc (printf "%s%s" "x" "y") }} // Returns "xy"</code>
Modify the TestFunc Argument Handling:
If your use case always involves concatenating strings for the TestFunc argument, you can modify the function to handle concatenation internally.
<code class="go">func TestFunc(strs ...string) string { return strings.Trim(strings.Join(strs, ""), " ") } {{ TestFunc "x" $var }} // Returns "xy"</code>
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