Contents

# Strain

Implement the `keep` and `discard` operation on collections. Given a collection
and a predicate on the collection's elements, `keep` returns a new collection
containing those elements where the predicate is true, while `discard` returns
a new collection containing those elements where the predicate is false.

For example, given the collection of numbers:

- 1, 2, 3, 4, 5

And the predicate:

- is the number even?

Then your keep operation should produce:

- 2, 4

While your discard operation should produce:

- 1, 3, 5

Note that the union of keep and discard is all the elements.

The functions may be called `keep` and `discard`, or they may need different
names in order to not clash with existing functions or concepts in your
language.

## Restrictions

Keep your hands off that filter/reject/whatchamacallit functionality
provided by your standard library!  Solve this one yourself using other
basic tools instead.


To run the tests:

```sh
$ gradle test
```

For more detailed info about the Java track see the [help page](http://exercism.io/languages/java).


## Source

Conversation with James Edward Gray II [https://twitter.com/jeg2](https://twitter.com/jeg2)

## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.

Version data entries

53 entries across 53 versions & 1 rubygems

Version	Path
trackler-2.2.1.47	tracks/java/exercises/strain/README.md
trackler-2.2.1.46	tracks/java/exercises/strain/README.md
trackler-2.2.1.45	tracks/java/exercises/strain/README.md
trackler-2.2.1.44	tracks/java/exercises/strain/README.md
trackler-2.2.1.43	tracks/java/exercises/strain/README.md
trackler-2.2.1.42	tracks/java/exercises/strain/README.md
trackler-2.2.1.41	tracks/java/exercises/strain/README.md
trackler-2.2.1.40	tracks/java/exercises/strain/README.md
trackler-2.2.1.39	tracks/java/exercises/strain/README.md
trackler-2.2.1.38	tracks/java/exercises/strain/README.md
trackler-2.2.1.37	tracks/java/exercises/strain/README.md
trackler-2.2.1.36	tracks/java/exercises/strain/README.md
trackler-2.2.1.35	tracks/java/exercises/strain/README.md
trackler-2.2.1.34	tracks/java/exercises/strain/README.md
trackler-2.2.1.33	tracks/java/exercises/strain/README.md
trackler-2.2.1.32	tracks/java/exercises/strain/README.md
trackler-2.2.1.31	tracks/java/exercises/strain/README.md
trackler-2.2.1.30	tracks/java/exercises/strain/README.md
trackler-2.2.1.29	tracks/java/exercises/strain/README.md
trackler-2.2.1.28	tracks/java/exercises/strain/README.md