Lesson 5.md

title	Lesson 5 - Creating Knight
sidebar_position	5

In the Module 2 function declaration lesson, we have created a first function called createKnight. In this lesson, we will use that function to create our first knight.

• To create a resource, we will use the create keyword and the move operator <-.
• You use the create keyword to initialize a resource. Resources must be created before you can use them.
• The move operator <- is used to move a resource into a variable. You cannot use the assignment operator = with resources, so when you initialize a resource, you will need to use the move operator <-.

access(all) contract HelloWorld {

    // Declare a resource that only includes one function.
    access(all) resource HelloAsset {}

    // We're going to use the built-in create function
    // to create a new instance of the HelloAsset resource
    access(all) fun createHelloAsset(): @HelloAsset {
        return <-create HelloAsset()
    }

    init() {
        // contract initializer function
    }
}

• Inside the storeCounty function, we use the force-move operator <-!. This is called the “force-move operator”. Cadence requires us to use this with dictionaries because it will abort the program if a Knight at the specific id already exists.
• This is protecting us from accidentally overwriting a Knight in the dictionary.

Put It to the Test

1. Open Flow Playground
2. Use create keyword and move operator to form your first Knight.