It permutes elements in an array, the "m" parameter is a boolean which determines if the function should return an array with an "index map" or the real value.
[UPDATED CODE AND HELP CAN BE FOUND HERE]
//+ Jonas Raoni Soares Silva //@ http://jsfromhell.com/array/permute [v1.0] permute = function( v, m ){ for( var j, l = v.length, i = ( 1 << l ) - 1, r = new Array( i ); i; ) for( r[--i] = [], j = l; j; i + 1 & 1 << --j && ( r[i].push( m ? j : v[j] ) ) ); return r; };
Example
document.write( permute( ["A", "B", "C" ], 1 ).join( "<br />" ), "<hr />" ); document.write( permute( ["A", "B", "C" ], 0 ).join( "<br />" ) );
