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 # DI
 Dependency injection for Go programming language.
 
-Dependency injection is one form of the broader technique of inversion of control. It is used to increase modularity of the program and make it extensible.
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+Dependency injection is one form of the broader technique of inversion of control. It is used to increase modularity of the program and make it extensible.
+
+## Examples
+```go
+type A struct {
+	Name string
+}
+
+func NewA() *A {
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	name := "A-" + strconv.Itoa(r.Int())
+	return &A{Name: ls}
+}
+
+services := NewServiceCollection()
+services.AddSingleton(NewA)
+serviceProvider := services.Build()
+
+var env *A
+_ = serviceProvider.GetService(&env) // used
+```
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