### Other utility functions

Any other utility function that you call directly can be created with normal `def` or `async def` and FastAPI won't affect the way you call it.

This is in contrast to the functions that FastAPI calls for you: *path operation functions* and dependencies.

      ListenableFuture<O> transform(
          ListenableFuture<I> input, Function<? super I, ? extends O> function, Executor executor) {
    return AbstractTransformFuture.create(input, function, executor);
  }

  /**
   * Like {@link #transform(ListenableFuture, Function, Executor)} except that the transformation
   * {@code function} is invoked on each call to {@link Future#get() get()} on the returned future.
   *

chrome.omnibox.onInputEntered.addListener(function(t) {
  var url = urlForInput(t);
  if (url) {
    chrome.tabs.query({ "active": true, "currentWindow": true }, function(tab) {
      if (!tab) return;
      chrome.tabs.update(tab.id, { "url": url, "selected": true });
    });
  }

# Advanced Dependencies

## Parameterized dependencies

All the dependencies we have seen are a fixed function or class.

But there could be cases where you want to be able to set parameters on the dependency, without having to declare many different functions or classes.

Let's imagine that we want to have a dependency that checks if the query parameter `q` contains some fixed content.

But we want to be able to parameterize that fixed content.

	exit 1
fi

trap 'catch $LINENO' ERR

function purge() {
	rm -rf "$1"
}

# shellcheck disable=SC2120
catch() {
	if [ $# -ne 0 ]; then
		echo "error on line $1"
	fi

	echo "Cleaning up instances of MinIO"
	pkill minio || true
	pkill -9 minio || true
	purge "$WORK_DIR"
	if [ $# -ne 0 ]; then
		exit $#
	fi
}

catch

function start_minio_10drive() {
	start_port=$1

import me.champeau.gradle.japicmp.report.ViolationCheckContext;

import java.util.AbstractMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import static gradlebuild.binarycompatibility.upgrades.UpgradedProperties.CURRENT_ACCESSORS_OF_UPGRADED_PROPERTIES;

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.function.Function;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.fess.es.client.SearchEngineClient;
import org.lastaflute.di.exception.IORuntimeException;

```

### Advantages of `Annotated`

**Using `Annotated` is recommended** instead of the default value in function parameters, it is **better** for multiple reasons. 🤓

The **default** value of the **function parameter** is the **actual default** value, that's more intuitive with Python in general. 😌

# Query Parameters

When you declare other function parameters that are not part of the path parameters, they are automatically interpreted as "query" parameters.

```Python hl_lines="9"
{!../../docs_src/query_params/tutorial001.py!}
```

The query is the set of key-value pairs that go after the `?` in a URL, separated by `&` characters.

For example, in the URL:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

  /**
   * @deprecated Provided to satisfy the {@code Function} interface; use {@link #get} or {@link
   *     #getUnchecked} instead.
   * @throws UncheckedExecutionException if an exception was thrown while loading the value. (As
   *     described in the documentation for {@link #getUnchecked}, {@code LoadingCache} should be
   *     used as a {@code Function} only with cache loaders that throw only unchecked exceptions.)
   */