How to best clear a slice: empty vs. nil
Remove all elements Keep allocated memory Empty slice vs. nil slice Remove all elements To remove all elements, simply set the slice to nil. a := []string{"A", "B", "C", "D", "E"} a = nil fmt.Println(a, len(a), cap(a)) // [] 0 0 This will release the underlying array to the garbage collector (assuming there are no other references). Keep allocated memory To keep the underlying array, slice the sli
Efficient string concatenation [full guide]
Clean and simple string building (fmt) High-performance string concatenation (stringbuilder) Before Go 1.10 (bytebuffer) Clean and simple string building For simple cases where performance is a non-issue, fmt.Sprintf is your friend. It’s clean, simple and fairly efficient. s := fmt.Sprintf("Size: %d MB.", 85) // s == "Size: 85 MB." The fmt cheat sheet lists the most common formatting verbs and fla
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