One of my favorite features in Go is the possibility of writing benchmark tests. At Go 1.24, this feature has a new look, making it easier to use.
To demonstrate these changes, let’s suppose a function that calculates the factorial recursively and one that calculates it through loops.
func FatorialRecursive(n int) int {
if n == 0 {
return 1
}
return n * FatorialRecursive(n-1)
}
func FatorialLoop(n int) int {
aux := 1
for i := 1; i <= n; i++ {
aux *= i
}
return aux
}
Previously, to write a benchmark, it was necessary to write down the whole execution loop of the test. When done, we need to run the command $ go test -bench .