How to solve 'undefined: bytes.Contains' error in golang?

When developing projects using the Go language, we may encounter errors such as "undefined: bytes.Contains". This error is usually caused by the Go version being used is too low, because the bytes.Contains function was added in Go 1.2. If your Go version is lower than 1.2, the compiler cannot find this function and prompts an "undefined: bytes.Contains" error.

So how to solve this problem? Two solutions are given below:

Solution 1: Upgrade the Go version

Upgrading the Go version is the simplest solution, and you can directly upgrade to a version above Go 1.2. The latest version of the Go language can be downloaded from the official website.

After the installation is complete, you can use the following command to check your Go version:

$ go version

If your version number is lower than 1.2, you need to upgrade the Go version to obtain the bytes.Contains function support. The method to upgrade Go is also very simple, just follow the instructions in the official documentation.

Solution 2: Implement the bytes.Contains function yourself

If you cannot upgrade the Go version, or you just don’t want to upgrade the Go version, then you can solve the problem by implementing the bytes.Contains function yourself This error.

The following is a simple implementation example:

func contains(s, substr []byte) bool {
    n := len(substr)
    if n == 0 {
        return true
    }
    if len(s) < n {
        return false
    }
    for i := 0; i <= len(s)-n; i++ {
        if bytes.Equal(s[i:i+n], substr) {
            return true
        }
    }
    return false
}

It should be noted that this implementation is not byte-level because it relies on the bytes.Equal function. But in most cases this implementation works fine.

Conclusion

When developing a project using the Go language, if you encounter an "undefined: bytes.Contains" error, you need to check whether the current Go version is lower than 1.2 and upgrade as necessary. If you cannot upgrade, you can also solve this error by implementing the bytes.Contains function yourself.

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