Golang a large number of string concatenation methods

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Although convenient, using the + = operator is not the most efficient way to append a string to the end of a string in a loop, a valid way is to prepare a string slice ([]string) and then use strings. The Join () function concatenates all strings together at once. But there's a better way to go, which works like StringBuilder in Java.

Package Mainimport ("bytes" "FMT") func main () {var buffer bytes.  Buffer//buffer is a variable-sized byte buffer that implements a read-write method for {if piece, OK: = GetNextString (); ok {/*   func (b *buffer) writestring (s string) (n int, err error)   Write writes the contents of S to the buffer, increasing the buffer capacity if necessary. The return value n is Len (p), and err is always nil. If the buffer becomes too large, write uses the error value Errtoolarge to raise the panic. */buffer. WriteString (piece)} else {break}}fmt. PRINTLN ("Results after stitching", buffer.) String ())}

After testing, connect 1 million strings, use buffer to consume about 77 milliseconds, use + = consume time for ... I'm sorry, I waited 5 minutes and I didn't run out. After reducing the order of magnitude, the time to connect 100,000 strings is 3312 milliseconds

In addition, the string output in the Golang has a length limit, do not know the specific limit of how much, over 10 million length will not show, over 100 billion liteide crashes ...