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Type Switches
A type switch makes it easy to do several type assertions in a series.
A type switch is similar to a regular switch statement, but the cases specify types instead of values.
func printNumericValue(num interface{}) {
switch v := num.(type) {
case int:
fmt.Printf("%T\n", v)
case string:
fmt.Printf("%T\n", v)
default:
fmt.Printf("%T\n", v)
}
}
func main() {
printNumericValue(1)
// prints "int"
printNumericValue("1")
// prints "string"
printNumericValue(struct{}{})
// prints "struct {}"
}
fmt.Printf("%T\n", v) prints the type of a variable.
Assignment
After submitting our last snippet of code for review, a more experienced gopher told us to use a type switch instead of successive assertions. Let's make that improvement!
Implement the getExpenseReport function using a type switch.