js-permutation

Permutations code bricks for JavaScript.

next( reversed( identity( 3 ) ) ) ; // [ 0 , 1 , 2 ]

Can be managed through jspm, duo, component, bower, ender, jam, spm, and npm.

Caveat

Requires regeneratorRuntime to be defined, see babel docs.

Install

jspm

jspm install github:aureooms/js-permutation
# or
jspm install npm:@aureooms/js-permutation

duo

No install step needed for duo!

component

component install aureooms/js-permutation

bower

bower install @aureooms/js-permutation

ender

ender add @aureooms/js-permutation

jam

jam install @aureooms/js-permutation

spm

spm install @aureooms/js-permutation --save

npm

npm install @aureooms/js-permutation --save

Require

jspm

let permutation = require( "github:aureooms/js-permutation" ) ;
// or
import permutation from '@aureooms/js-permutation' ;

duo

let permutation = require( "aureooms/js-permutation" ) ;

component, ender, spm, npm

let permutation = require( "@aureooms/js-permutation" ) ;

bower

The script tag exposes the global variable permutation.

Alternatively, you can use any tool mentioned here.

jam

require( [ "@aureooms/js-permutation" ] , function ( permutation ) { ... } ) ;

Use

let sigma = permutation.identity( 3 ) ;

sigma ; // [ 0 , 1 , 2 ]

permutation.reversed( sigma ) ; // [ 2 , 1 , 0 ]

permutation.next( sigma ) ; // [ 0 , 2 , 1 ]

for ( let tau of permutation.permutations( 3 ) ) {

	... // yields [ 0 , 1 , 2 ]
	    //        [ 0 , 2 , 1 ]
	    //        [ 1 , 0 , 2 ]
	    //        [ 1 , 2 , 0 ]
	    //        [ 2 , 0 , 1 ]
	    //        [ 2 , 1 , 0 ]

}

permutation.invert( [ 0 , 1 , 2 ] ) ; // [ 0 , 1 , 2 ]
permutation.invert( [ 0 , 2 , 1 ] ) ; // [ 0 , 2 , 1 ]
permutation.invert( [ 1 , 0 , 2 ] ) ; // [ 1 , 0 , 2 ]
permutation.invert( [ 1 , 2 , 0 ] ) ; // [ 2 , 0 , 1 ]
permutation.invert( [ 2 , 0 , 1 ] ) ; // [ 1 , 2 , 0 ]
permutation.invert( [ 2 , 1 , 0 ] ) ; // [ 2 , 1 , 0 ]

permutation.compose( "abc" , [ 2 , 0 , 1 ] ) ; // [ "c" , "a" , "b" ]

permutation.bitreversal( 8 ) ; // [ 0 , 4 , 2 , 6 , 1 , 5 , 3 , 7 ]