Percom

![npm version](https://badge.fury.io/js/percom) ![Build Status](https://travis-ci.org/kota-yata/Percom) ![License: MIT](https://opensource.org/licenses/MIT)

![NPM](https://nodei.co/npm/percom/)

Combination and Permutation library

Usage

``$ npm i percom`

## 1. Combinatioins (組み合わせ)`JavaScript const percom = require("percom"); percom.com(array,num); //array => Target array (対象の配列) //num => Number to combine as combinations (組み合わせの数)`#### Example`JavaScript const array = ["A","B","C"]; const result1 = percom.com(array, 2); //result1 = [ [ "A", "B" ], [ "A, "C ], [ "B", "C" ] ] const result2 = percom.com(array, 1); //result2 = [ [ "A" ], [ "B" ], [ "C" ] ]`

### Count the number of combination elements (組み合わせの数を数える)`JavaScript percom.countCom(n, r); //n => Number of elements : int (要素数) //r => Number to choose : int (選ぶ要素の数)`#### Example`JavaScript percom.countCom(8, 3); // => 56`## 2. Permutations (順列)`JavaScript percom.per(array,num); //array => Target array (対象の配列) //num => Number to combine as permutations (一つ一つの順列の要素数)`#### Example`JavaScript const array = ["A","B","C"]; const result1 = percom.per(array, 2); //result1 = [ [ 'A', 'B' ], [ 'A', 'C' ], [ 'B', 'A' ], [ 'B', 'C' ], [ 'C', 'A' ], [ 'C', 'B' ] ] const result2 = percom.per(array, 1); //result2 = [ [ "A" ], [ "B" ], [ "C" ] ]`### Count the number of permutation elements (順列の数を数える)`JavaScript percom.countPer(n, r); //n => Number of elements : int (要素数) //r => Number to choose : int (選ぶ要素の数)`#### Example`JavaScript percom.countPer(8, 3); // => 336`

`Test Coverage`


!image
Both uncovered lines are returning of recursive function 
License

  percom is under MIT license
  
Development

javascript
yarn install

// before create PR yarn mocha``
Since lint-staged and husky are set up, your code will be formatted before commit.

Developer

Kota Yatagai (https://twitter.com/kota_yata)

Usage


$ npm i percom

  ## 1. Combinatioins (組み合わせ)

JavaScript
    const percom = require("percom");
  
    percom.com(array,num); 
    //array => Target array (対象の配列)
    //num => Number to combine as combinations (組み合わせの数)


  #### Example

JavaScript
    const array = ["A","B","C"];
    
    const result1 = percom.com(array, 2);
    //result1 = [ [ "A", "B" ], [ "A, "C ], [ "B", "C" ] ]
    
    const result2 = percom.com(array, 1);
    //result2 = [ [ "A" ], [ "B" ], [ "C" ] ]

  ### Count the number of combination elements (組み合わせの数を数える)

JavaScript
    percom.countCom(n, r);
    //n => Number of elements : int (要素数)
    //r => Number to choose : int (選ぶ要素の数)


  #### Example

JavaScript
    percom.countCom(8, 3);
    // => 56


  
  ## 2. Permutations (順列)

JavaScript
    percom.per(array,num);
    //array => Target array (対象の配列)
    //num => Number to combine as permutations (一つ一つの順列の要素数)


 
  #### Example

JavaScript
    const array = ["A","B","C"];
    
    const result1 = percom.per(array, 2);
    //result1 = [ [ 'A', 'B' ], [ 'A', 'C' ], [ 'B', 'A' ], [ 'B', 'C' ], [ 'C', 'A' ], [ 'C', 'B' ] ]
    
    const result2 = percom.per(array, 1);
    //result2 = [ [ "A" ], [ "B" ], [ "C" ] ]


  ### Count the number of permutation elements (順列の数を数える)

JavaScript
    percom.countPer(n, r);
    //n => Number of elements : int (要素数)
    //r => Number to choose : int (選ぶ要素の数)


  #### Example

JavaScript
    percom.countPer(8, 3);
    // => 336