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LaunchDarkly sample Go application

We've built a simple console application that demonstrates how LaunchDarkly's SDK works.

Below, you'll find the basic build procedure. For more comprehensive instructions, you can visit your Quickstart page or the Go SDK reference guide.

This demo requires Go 1.21 or higher.

Build instructions

  1. Set the environment variable LAUNCHDARKLY_SDK_KEY to your LaunchDarkly SDK key.

     export LAUNCHDARKLY_SDK_KEY=my-sdk-key

  2. If there is an existing boolean feature flag in your LaunchDarkly project that you want to evaluate, set LAUNCHDARKLY_FLAG_KEY to the flag key; otherwise, a boolean flag of sample-feature will be assumed.

    export LAUNCHDARKLY_FLAG_KEY=my-boolean-flag

  3. On the command line, run go build. Follow the instruction to run go mod tidy if go build said updates to go.mod is needed.

  4. Run ./hello-go

You should receive the message "The feature flag evaluates to .". The application will run continuously and react to the flag changes in LaunchDarkly.