Go中函数名称之前的参数？ [重复]

I have seen some Go functions defined like this:

type poly struct {
    coeffs [256]uint16
}

func (p *poly) reset() {
    for i := range p.coeffs {
        p.coeffs[i] = 0
    }
}

Which you can later call as:

var p poly
p.reset()

I haven't seen this in other programming languages that I know. What's the purpose of p *poly in the reset function? It seems to be like a function parameter but written before the function name. Any clarification for it?

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It means that reset() is a method on *poly. This is very basic Go; you really need to start with the Go tour. Trying to read Go without a basic understanding of its syntax is going to be very confusing.