The Enumerate java class provides a generic method to iterate over an iterable collection, providing access to each element and it's index within the collection. It allows enumeration over a collection similar to the enumerate() function in Python.
The following pseudo control structure is introduced to enumerate over a collection with minimal complexity when compared to a regular for-each loop:
Enumerate.over(iterable, (item, i) -> {
...
});The above example uses a lambda expession to define the task to be performed each iteration.
This also allows for the item and i parameters to be renamed as required.
This can also be used to iterate over an array as shown in the below example:
String[] arr = ["Zero", "One"]
Enumerate.over(arr, (str, i) -> {
System.out.println(i+": "str);
});This would produce the following output:
0: Zero
1: One
It may also be written using the full interface to demonstrate how this construct works:
List<String> list = new ArrayList<>();
list.add("Zero");
list.add("One");
Enumerate.over(list, new Iteration<String>() {
@Override
public void accept(String item, int i) {
System.out.println(i+": "item);
}
});Enumerate for Java is available via the Jitpack.io repository. You can find instructions to add it as a dependency to your project here.
Alternatively the jar files for the latest release can be downloaded here.