It arranges elements in an array, the "n" parameter determines the amount of elements in each combination and the "m" one is a boolean which says if the function should return an array with an "index map" or real values.
[UPDATED CODE AND HELP CAN BE FOUND HERE]
//+ Jonas Raoni Soares Silva //@ http://jsfromhell.com/array/arrange [v1.0] arrange = function( v, n, m ){ for( var i, j, k, sep = sep || "", l = v.length, r = new Array( i = Math.pow( l, n ) ), c = ( new Array( n + 1 ) ).join( 0 ).split( "" ); i; ) for( r[--i] = new Array( j = n ), k = 1; j--; r[i][j] = m ? c[j] : v[c[j]], k && ( ++c[j] != l && --k, c[j] %= l ) ); return r; };
Example
document.write( arrange( ["A", "B", "C" ], 3, 1 ).join( "<br />" ), "<hr />" ); document.write( arrange( ["A", "B", "C" ], 3, 0 ).join( "<br />" ) );
