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How to measure the execution time of a function in Golang?
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Go: Function's execution time
To get execution time of a function in go we can use defer function because defer functions execute even if the code get an error so you always get the execution time.
Function's execution time Example
// timer returns a function that prints the name argument and
// the elapsed time between the call to timer and the call to
// the returned function. The returned function is intended to
// be used in a defer statement:
//
func timer(name string) func() {
start := time.Now()
return func() {
fmt.Printf("%s took %v\n", name, time.Since(start))
}
}
func main() {
defer timer("main")() // <-- The trailing () is the deferred call
time.Sleep(time.Second * 2)
}
// prints: main took 2s