Go - Set structure

package collection_test

import (
    "fmt"
    "<Project>/collection"
)

func ExampleSet() {
    s := collection.NewSet()

    // Set values
    s.Set("value1")
    s.Set("value2")

    // Check
    fmt.Println(s.Contains("value1"))
    fmt.Println(s.Contains("value2"))

    // Remove
    s.Remove("value2")

    // Removed so does not exists.
    fmt.Println(s.Contains("value2"))

    // Output:
    // true
    // true
    // false
}