Ok in Go

Calling functions returns an ok variable, which can be used to check if the operation completed successfully.

This is known as the 'comma ok' idiom.

str, ok := value.(string)
if ok {
    fmt.Printf("string value is: %q\n", str)
} else {
    fmt.Printf("value is not a string\n")
}

Or a shorter version:

if seconds, ok := timeZone[tz]; ok {
    return seconds
}

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