A few tips for quickly optimizing Golang code

This article will provide some code optimization guidelines, hoping to help developers enhance their program performance and simplify development, achieve more efficient and robust coding, and unlock the potential of Golang applications. Below are some useful and universal code snippets randomly selected from my commonly used practical libraries for development.

Tracking Execution Time

If you want to track the execution time of a function in Go, there is a simple and efficient trick: just use the defer keyword to implement one line of code. You only need one TrackTime function:

func TrackTime(pre time.Time) time.Duration {
  elapsed := time.Since(pre)
  fmt.Println("elapsed:", elapsed)  return elapsed
}func TestTrackTime(t *testing.T) {
  defer TrackTime(time.Now()) // <--- THIS  time.Sleep(500 * time.Millisecond)
}// elapsed: 501.11125ms

Pre-allocated slices

Pre-allocating slices or maps can significantly improve Go’s performance.

We can use pre-allocated zero-length slices without specifying the length of the array. We can use append to manipulate the slices.

// 不推荐
a := make([]int, 10)
a[0] = 1// 推荐用法
b := make([]int, 0, 10)
b = append(b, 1)

Chain call

The technique of chaining calls can be applied to functions (pointers) with receivers. To illustrate this point, first write a Person structure…