如何检查[] byte是否为全零

Is there a way to check if a byte slice is empty or 0 without checking each element or using reflect?

theByteVar := make([]byte, 128)

if "theByteVar is empty or zeroes" {
   doSomething()
}

One solution which seems weird that I found was to keep an empty byte array for comparison.

theByteVar := make([]byte, 128)
emptyByteVar := make([]byte, 128)

// fill with anything
theByteVar[1] = 2

if reflect.DeepEqual(theByteVar,empty) == false {
   doSomething(theByteVar)
}

For sure there must be a better/quicker solution.

Thanks

UPDATE did some comparison for 1000 loops and the reflect way is the worst by far...

Equal Loops: 1000 in true in 19.197µs
Contains Loops: 1000 in true in 34.507µs
AllZero Loops: 1000 in true in 117.275µs
Reflect Loops: 1000 in true in 14.616277ms

You can possibly use bytes.Equal or bytes.Contains to compare with a zero initialized byte slice, see https://play.golang.org/p/mvUXaTwKjP, I haven't checked for performance, but hopefully it's been optimized. You might want to try out other solutions and compare the performance numbers, if needed.

Comparing it with another slice containing only zeros, that requires reading (and comparing) 2 slices.

Using a single for loop will be more efficient here:

for _, v := range theByteVar {
    if v != 0 {
        doSomething(theByteVar)
        break
    }
}

If you do need to use it in multiple places, wrap it in a utility function:

func allZero(s []byte) bool {
    for _, v := range s {
        if v != 0 {
            return false
        }
    }
    return true
}

And then using it:

if !allZero(theByteVar) {
    doSomething(theByteVar)
}