What is the easiest method to create an empty buffer of size n in Go using bytes.NewBuffer()?
Adding some additional info here. The quick way to create a new buffer is briefly mentioned at the end of the doc string:
b := new(bytes.Buffer)
or
b := &bytes.Buffer{}
The Buffer struct define includes a 64 byte internal bootstrap field that is initially used for small allocations. Once the default size is exceeded, a byte slice Buffer.buf is created and internally maintained.
As @leafbebop suggested we can pre-initalize the buf field of the Buffer struct using a new slice.
b := bytes.NewBuffer(make([]byte,0,N))
I also found another option to use the Grow() method:
b := new(bytes.Buffer)
b.Grow(n)
Also it's interesting to point out that the internal buf slice will grow at a rate of cap(buf)*2 + n. This means that if you've written 1MB into a buffer and then add 1 byte, your cap() will increase to 2097153 bytes.