How to Resolve 'invalid memory address or nil pointer dereference' Errors in Go Maps?

invalid memory address or nil pointer dereference in Go map[string]*type

When attempting to access a value in a map, you may encounter the error "invalid memory address or nil pointer dereference." This error occurs when the key being queried does not exist within the map or if the value stored at that key is a nil pointer.

In this specific case, the code attempts to access the "id" key within the "condition" map. However, the "condition" map is initialized as an empty map without any key-value pairs. Thus, when trying to access "condition['id']", the key does not exist, and an attempt is made to access a nil pointer. This results in the "invalid memory address or nil pointer dereference" error.

To resolve this issue, you can initialize the "condition" map and set the value of the "id" key before attempting to access it. Here's an example:

// Initialize the condition map
condition = make(map[string]*guardduty.Condition)

// Set the value of the "id" key
condition["id"] = &guardduty.Condition{
    Equals: aws.StringSlice(findingId),
}

After initializing the map and setting the value of the "id" key, you can now access it safely without encountering the error.

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