# Golang Hello World

This section only describe how to write and run a HelloWorld with Golang. Go to Cadence-Samples (opens new window) for more examples, and Cadence-Client (opens new window) and go-docs (opens new window) for more documentation.

# Include Golang cadence-client dependency

Add cadence-client library to your project by running the command:

go get go.uber.org/cadence

# Implement HelloWorld Workflow

package main

import (
	"context"
	"time"

	"go.uber.org/cadence/activity"
	"go.uber.org/cadence/workflow"
	"go.uber.org/zap"
)

/**
 * This is the hello world workflow sample.
 */

// ApplicationName is the task list for this sample
const ApplicationName = "helloWorldGroup"

// helloWorkflow workflow decider
func helloWorldWorkflow(ctx workflow.Context, name string) error {
	ao := workflow.ActivityOptions{
		ScheduleToStartTimeout: time.Minute,
		StartToCloseTimeout:    time.Minute,
		HeartbeatTimeout:       time.Second * 20,
	}
	ctx = workflow.WithActivityOptions(ctx, ao)

	logger := workflow.GetLogger(ctx)
	logger.Info("helloworld workflow started")
	var helloworldResult string
	err := workflow.ExecuteActivity(ctx, helloWorldActivity, name).Get(ctx, &helloworldResult)
	if err != nil {
		logger.Error("Activity failed.", zap.Error(err))
		return err
	}

	logger.Info("Workflow completed.", zap.String("Result", helloworldResult))

	return nil
}

func helloWorldActivity(ctx context.Context, name string) (string, error) {
	logger := activity.GetLogger(ctx)
	logger.Info("helloworld activity started")
	return "Hello " + name + "!", nil
}

# Implement Worker

Follow the worker documentation or the samples (opens new window) to implement the worker.

# Start the Worker and Workflow

Build the worker program with your project. You can follow the way in the sample (opens new window).

Then start the worker:

./bin/helloworld -m worker

And start a workflow:

./bin/helloworld

# What is Next

Now you have completed the tutorials. You can continue to explore the key concepts in Cadence, and also how to use them with Go Client