----
====

[[sec:declaring_variables]]
=== Declare Variables

Build scripts can declare two variables: *local variables* and *extra properties*.

[[sec:local_variables]]
==== Local Variables

[.multi-language-text.lang-kotlin]
Declare local variables with the `val` keyword. Local variables are only visible in the scope where they have been declared. They are a feature of the underlying Kotlin language.

Tasks runnable from project ':app'
------------------------------------------------------------

Help tasks
----------
buildEnvironment - Displays all buildscript dependencies declared in project ':app'.
dependencies - Displays all dependencies declared in project ':app'.
dependencyInsight - Displays the insight into a specific dependency in project ':app'.
help - Displays a help message.

include::sample[dir="snippets/artifacts/dependencyBasics/groovy",files="build.gradle[]"]
====

            CALL 'public final fun plus (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=PLUS
              $this: CALL 'public final fun plus (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=PLUS
                $this: CALL 'public final fun callFoo (foo: <root>.Foo): kotlin.Int declared in <root>.ContextKt' type=kotlin.Int origin=null

   * font/woff} to be the correct media type for WOFF, but this may be necessary in certain
   * situations for compatibility.
   *
   * @since 17.0
   */
  public static final MediaType WOFF = createConstant(APPLICATION_TYPE, "font-woff");

  /**
   * <a href="https://tools.ietf.org/html/rfc8081">RFC 8081</a> declares {@link #FONT_WOFF2

include::sample[dir="snippets/providers/property/groovy",files="build.gradle[tags=prov-managed]"]
====

=== Mutable Managed Properties

A mutable managed property is declared using an abstract getter method of type `Property<T>`, where `T` can be any serializable type or a <<#managed_types,fully managed Gradle type>>.
The property must not have any setter methods.

The dependency injection system requires pre-registration of the dependencies and the dependencies are solved based on the declared types. So, it's not possible to declare more than one "component" that provides a certain type.

   * font/woff} to be the correct media type for WOFF, but this may be necessary in certain
   * situations for compatibility.
   *
   * @since 17.0
   */
  public static final MediaType WOFF = createConstant(APPLICATION_TYPE, "font-woff");

  /**
   * <a href="https://tools.ietf.org/html/rfc8081">RFC 8081</a> declares {@link #FONT_WOFF2

	// InvalidInitSig occurs when an init function declares parameters or
	// results.
	//
	// Example:
	//  func init() int { return 1 }
	InvalidInitSig

	// InvalidInitDecl occurs when init is declared as anything other than a
	// function.
	//
	// Example:
	//  var init = 1
	InvalidInitDecl

	// InvalidMainDecl occurs when main is declared as anything other than a
	// function, in a main package.

          public open fun toString (): kotlin.String [fake_override] declared in <root>.Intf
        $this: VALUE_PARAMETER name:<this> type:kotlin.Any
      FUN name:run visibility:public modality:OPEN <> ($this:<root>.Generic<T of <root>.Generic>) returnType:kotlin.Unit
        overridden:
          public abstract fun run (): kotlin.Unit declared in <root>.Intf