Dev guideAPI Reference
Dev guideAPI ReferenceUser GuideGitHubNuGetDev CommunitySubmit a ticketLog In
GitHubNuGetDev CommunitySubmit a ticket

Example usage of the Go SDK

A brief code example of how to use the Optimizely Feature Experimentation Go SDK to evaluate feature flags, activate A/B tests, or feature tests.

Once you have installed an SDK, import the Optimizely Feature Experimentation library into your code, get your Optimizely Feature Experimentation project's datafile, and instantiate a client. Then, you can use the client to evaluate flag rules, including A/B tests and flag deliveries.

This example demonstrates the basic usage of each of these concepts:

  1. Evaluate a flag with the key product_sort using the Decide method. As a side effect, the Decide function also sends a decision event to Optimizely Feature Experimentation to record that the current user has been exposed to the experiment.

  2. Conditionally execute your feature code. You have a couple of options:

  • Fetch the flag-enabled state, then check a configuration variable on the flag called sort_method. The SDK evaluates your flag rules and determines what flag variation the user is in, and therefore which sort method variable they should see.
  • Fetch on the flag variation, then run 'control' or 'treatment' code.
  1. Use event tracking to track an event called purchased. This conversion event measures the impact of an experiment. Using the Track Event method, the purchase is automatically attributed back to the running A/B test for which we made a decision, and the SDK sends a network request to Optimizely Feature Experimentation through the customizable event dispatcher so Optimizely can count it in your results page.
import optly "" // for v2: ""

optimizely_client, err := optly.Client("SDK_KEY_HERE")
if err != nil {
	// handle the err
// create a user and decide a flag rule (such as an A/B test) for them
user := optimizely_client.CreateUserContext("user123", map[string]interface{}{"logged_in": true})
decision := user.Decide("product_sort", []decide.OptimizelyDecideOptions{})

var variationKey string
if variationKey = decision.VariationKey; variationKey == "" {
  fmt.Printf("[decide] error: %v", decision.Reasons)

// execute code based on flag enabled state
enabled := decision.Enabled

if enabled {
  // get flag variable values
  var value1 string
  decision.Variables.GetValue("sort_method", &value1)
  // or:
  value2 := decision.Variables.ToMap()["sort_method"].(string)

// or execute code based on flag variation:
if variationKey == "control" {
  // Execute code for control variation
} else if variationKey == "treatment" {
  // Execute code for treatment variation

// Track a user event
user.TrackEvent("purchased", nil)

For a more detailed and runnable code example, see the Quickstart.