##programming #software_design #design_pattern #behavioural_pattern

Strategy Pattern

Strategy Pattern Using Golang

It lets me define a family of algorithms, encapsulate each one, and make them interchangeable.

Strategy lets the algorithm vary independently from clients that use it.

Analogy

Imagine if i have a specific goal like computing something or doing some task , but there might be different way to go about it , this is what the Strategy Pattern all about

Example

Imagine a navigation app like Google Maps:

It can show directions by driving, walking, bicycling, or public transit.

Each is a strategy for finding directions.

You can switch between them at runtime.

✅ When to Use Strategy Pattern

You want to use different variants of an algorithm (e.g., different sorting techniques).
You want to avoid using many conditional statements (if-else or switch) to choose behavior.
You want to make algorithms interchangeable and independently testable.

🏗️ Structure of Strategy Pattern

type Strategy interface {
    Execute(data string) string
}
type ConcreteStrategyA struct{}
func (s *ConcreteStrategyA) Execute(data string) string {
    return "ConcreteStrategyA: " + data
}
type ConcreteStrategyB struct{}
func (s *ConcreteStrategyB) Execute(data string) string {
    return "ConcreteStrategyB: " + data
}
type Context struct {
    strategy Strategy
}
func (c *Context) SetStrategy(strategy Strategy) {
    c.strategy = strategy
}
func (c *Context) ExecuteStrategy(data string) string {
    return c.strategy.Execute(data)
}