Existing Groovy methods will not be removed immediately.

## Consequences

* If we would have used `Closure`, we must instead use `Action<T>`, `Spec<T>`, `Callable<T>`, or `Transformer<OUT, IN>`.
* We need to ensure all APIs that are exposed in the Groovy DSL go through runtime decoration.
Runtime decoration mixes in methods that use Groovy Closures to maintain consistent behavior in Groovy DSL.

        final String script = "def sum = 0; for (int i = 1; i <= n; i++) { sum += i }; return sum";
        assertEquals(15, groovyEngine.evaluate(script, params));
    }

    /**
     * Test that closures work
     */
    @Test
    public void test_evaluate_closures() {
        final Map<String, Object> params = new HashMap<>();
        final String script = "def multiply = { x, y -> x * y }; return multiply(6, 7)";

</p>

<pre>
f := func(x, y int) int { return x + y }
func(ch chan int) { ch &lt;- ACK }(replyChan)
</pre>

<p>
Function literals are <i>closures</i>: they may refer to variables
declared in a surrounding function. Those variables are then shared between
the surrounding function and the function literal, and they survive as long
as they are accessible.
</p>

    // edges, so this traversal would require reusing the undirected AB edge.
    return false;
  }

  /**
   * Returns the transitive closure of {@code graph}. The transitive closure of a graph {@code G} is
   * a graph {@code T} that is a supergraph of {@code G}, augmented by, for each pair of nodes A and

     */
    private Exception contentException;

    /**
     * The headers of the response.
     */
    private Map<String, List<String>> headers;

    /**
     * Closes the content cache if it is not null.
     *
     * @throws IOException if an I/O error occurs.
     */
    @Override
    public void close() throws IOException {
        if (contentCache != null) {

    * E.g., `await myfile.seek(0)` would go to the start of the file.
    * This is especially useful if you run `await myfile.read()` once and then need to read the contents again.
* `close()`: Closes the file.

As all these methods are `async` methods, you need to "await" them.

For example, inside of an `async` *path operation function* you can get the contents with:

```Python
contents = await myfile.read()

                    throw e;
                }
            });
        } catch (final ExecutionException e) {
            throw (RuntimeException) e.getCause();
        }
    }

    /**
     * Closes all cached GroovyClassLoaders and clears the script cache.
     * Called by the DI container on shutdown.
     */
    @PreDestroy
    public void close() {
        scriptCache.invalidateAll();

// punctuation properly. Use golang.org/x/text/cases instead.
func Title(s []byte) []byte {
	// Use a closure here to remember state.
	// Hackish but effective. Depends on Map scanning in order and calling
	// the closure once per rune.
	prev := ' '
	return Map(
		func(r rune) rune {
			if isSeparator(prev) {
				prev = r
				return unicode.ToTitle(r)
			}

* Dans de nombreux cas, il est préférable de comprendre leur **problème sous‑jacent ou cas d'utilisation**, car il pourrait exister une meilleure façon de le résoudre que ce qu'ils essaient de faire.

### Demander la clôture { #ask-to-close }

S'ils répondent, il y a de fortes chances que vous ayez résolu leur problème, bravo, **vous êtes un héros** ! 🦸

* Maintenant, si cela a résolu leur problème, vous pouvez leur demander de :

   * default, OkHttp will perform lazy initialization upon the first usage of the cache.
   */
  @Throws(IOException::class)
  fun initialize() {
    cache.initialize()
  }

  /**
   * Closes the cache and deletes all of its stored values. This will delete all files in the cache
   * directory including files that weren't created by the cache.
   */
  @Throws(IOException::class)
  fun delete() {