FieldsOrPropertiesExtractor (AssertJ fluent assertions 3.18.1 API)

java.lang.Object
- org.assertj.core.groups.FieldsOrPropertiesExtractor

```
public class FieldsOrPropertiesExtractor
extends Object
```
Understands how to retrieve fields or values from a collection/array of objects.
You just have to give the field/property name or a Function implementation, a collection/array of objects and it will extract the list of field/values from the given objects.

Author:

Joel Costigliola, Mateusz Haligowski

Constructor Summary

Constructors
Constructor Description

FieldsOrPropertiesExtractor()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`private static void`	`checkObjectToExtractFromIsNotNull(Object object)`
`static <F,T> T[]`	`extract(F[] objects, Function<? super F,T> extractor)`	Call `extract(Iterable, Function)` after converting objects to an iterable.
`static <F,T> List<T>`	`extract(Iterable<? extends F> objects, Function<? super F,T> extractor)`	Behavior is described in `AbstractIterableAssert.extracting(Function)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FieldsOrPropertiesExtractor
```
public FieldsOrPropertiesExtractor()
```
- Method Detail
  - extract
```
public static <F,T> T[] extract(F[] objects,
                                      Function<? super F,T> extractor)
```
    Call extract(Iterable, Function) after converting objects to an iterable.
    Behavior is described in javadoc AbstractObjectArrayAssert.extracting(Function)
    
    Type Parameters:
    
    F - type of elements to extract a value from
    
    T - the extracted value type
    
    Parameters:
    
    objects - the elements to extract a value from
    
    extractor - the extractor function
    
    Returns:
    
    the extracted values
  - extract
```
public static <F,T> List<T> extract(Iterable<? extends F> objects,
                                          Function<? super F,T> extractor)
```
    Behavior is described in AbstractIterableAssert.extracting(Function)
    
    Type Parameters:
    
    F - type of elements to extract a value from
    
    T - the extracted value type
    
    Parameters:
    
    objects - the elements to extract a value from
    
    extractor - the extractor function
    
    Returns:
    
    the extracted values
  - checkObjectToExtractFromIsNotNull
```
private static void checkObjectToExtractFromIsNotNull(Object object)
```