How Can I Prepend a String to a Variadic Slice of Interfaces in Go?

Properly Prepending Strings to Slices of Interfaces in Go

In Go, the append() function can only add values of the same type as the slice's elements. However, when dealing with a method that accepts a variadic slice of interfaces (...interface{}), prepending a string can be challenging.

To resolve this issue, wrap the string in a slice of interfaces before appending it to the variadic slice:

s := "first"
rest := []interface{}{"second", 3}

all := append([]interface{}{s}, rest...)

By enclosing the string in a slice of interfaces, append() can add it to the slice properly. The fmt.Println(all) output will be:

[first second 3]

This approach ensures that the prepended string type matches the slice's underlying interface type, allowing for proper concatenation.

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