golang 将两个切片追加在一起

Posted 2021-05-24

s1 := []int{1, 2}
s2 := []int{3, 4}
s3 := append(s1, s2...)
fmt.Println(s3)

golang 自定义切片追加方法

func AppendByte(slice []byte, data ...byte) []byte {
	m := len(slice)
	n := m + len(data)
	if n > cap(slice) { // if necessary, reallocate
		// allocate double what's needed, for future growth.
		newSlice := make([]byte, (n+1)*2)
		copy(newSlice, slice)
		slice = newSlice
	}
	slice = slice[0:n]
	copy(slice[m:n], data)
	return slice
}