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// repository documentation

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# Next
[![GoDoc](https://godoc.org/klaidliadon.dev/next?status.svg)](https://godoc.org/klaidliadon.dev/next)
[![Build Status](https://travis-ci.org/klaidliadon/next.svg?branch=master)](https://travis-ci.org/klaidliadon/next) 
[![codecov.io](https://codecov.io/github/klaidliadon/next/coverage.svg?branch=master)](https://codecov.io/github/klaidliadon/next?branch=master)

The package calculates asynchronously combinations and permutations of a collection of values.

To add the package recommended:

```sh
go get klaidliadon.dev/next
```

## Functionalities

- Combinations
- Combinations with repetitions
- Permutations
- Permutations with repetitions

## Usage

Just use create a new channel using `Combination()` or `Permutation()` and receive the results.

```go
package main

import (
	"fmt"
	"klaidliadon.dev/next"
)

func main() {
	for v := range next.Combination([]int{1,2,3,4}, 2, true) {
		fmt.Println(v)
	}
}
```

Produces

```
[1 1]
[1 2]
[1 3]
[1 4]
[2 2]
[2 3]
[2 4]
[3 3]
[3 4]
[4 4]
```

## Roadmap

The 4 main cases of combinatronics are covered:
 
- [x] Combinations
- [x] Combinations with repetitions
- [x] Permutations
- [x] Permutations with repetitions

The future updates will improve performance and memory usage.

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