How to Avoid the \'Unused Variable in a For Loop\' Error in Go?

Avoiding the "Unused Variable in a For Loop" Error

When using a for loop with the range keyword, it is common to encounter the "unused variable" error. This error occurs when a variable declared within the for loop is not used.

Consider the following code:

ticker := time.NewTicker(time.Millisecond * 500)
go func() {
    for t := range ticker.C {
        fmt.Println("Tick at", t)
    }
}()

The error will be triggered because the variable t is not used within the for loop.

To avoid this error, there are two options:

1. Use an underscore prefix:

   By prefixing the variable with an underscore (_), you indicate that the variable will not be used.

   for _ := range ticker.C {
       fmt.Println("Tick")
   }

2. Omit the variable assignment:

   You can also completely omit the variable assignment, as follows:

   for range ticker.C {
       fmt.Println("Tick")
   }

In the latter case, the compiler will automatically assign the variable _ to the range variable, avoiding the error.

By following these methods, you can effectively avoid the "unused variable in a for loop" error in your Golang code.

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