String concatenation

It is generally more efficient to use the bytes.Buffer type to build strings rather than concatenating strings using the + operator.

Look at this poor performance code:

s := ""  
for i := 0; i < 100000; i++ {  
  s += "x"  
}  
fmt.Println(s)

This code will create a new string on each iteration of the loop, which can be inefficient and may lead to poor performance.

Instead, you can use the strings.Builder to build the string more efficiently:

var builder strings.Builder  
  
for i := 0; i < 100000; i++ {  
  builder.WriteString("x")  
}  
  
s := builder.String()  
fmt.Println(s)