fmt.Printf, fmt.Println, and similar formatting and printing functions.
In their format strings, formatting functions use formatting verbs, like %s, %d, %v, and others.
If formatting verbs are used incorrectly, the result of a formatting function will contain an error.
For more information about formatting verbs, refer to Package fmt at go.dev.
Example:
fmt.Printf("id: %s", 42)The output of this function is id: %!s(int=42). It might be not what you really want.
The following function uses the %d formatting verb.
The output with the %d formatting verb will be id: 42.
fmt.Printf("id: %d", 42)