Feature Flags

Feature flags are at the core of VWO's Feature Management and Experimentation capabilities. They allow you to control feature rollouts and conduct experiments.

GetFlag()

The GetFlag() function is used to fetch the status and variables of a feature flag for a given user.

flag, err := instance.GetFlag("feature_key", userContext)
if err != nil {
    // Handle error
}

if flag.IsEnabled() {
    // Feature is enabled for this user
    // Implement the feature
} else {
    // Feature is disabled for this user
    // Implement fallback behavior
}

Parameter Definitions

Parameter	Type	Description
feature_key Required	string	unique identifier for the particular feature flag that you're implementing. You will see this while creating a feature flag, and you can also find it under 'Settings' for the Feature Flag after creating it.
userContext Required	map[string]interface{}	Contains information about the current user, including a required unique identifier for each user. Read more about userContext here.

Return Value

The GetFlag() function returns a GetFlagResponse object, which has the following methods:

IsEnabled(): Returns a boolean indicating if the feature is enabled for the user.
GetVariables(): Returns a list of variables associated with the feature.
GetVariable(key string, defaultValue interface{}): Returns the value of a specific variable.

Example Usage

flag, err := instance.GetFlag("new_checkout", userContext)
if err != nil {
    log.Fatal(err)
}

if flag.IsEnabled() {
    // Implement new checkout flow
    buttonColor := flag.GetVariable("button_color", "blue")
    // Use buttonColor in your UI
} else {
    // Use old checkout flow
}

Remember that the feature flag must be defined in your VWO dashboard before using it in your code.