var a = ["A", "B", "C", "D"], j = permute(a);
document.write(
    "<h2>", a.join(" - "), " = ", j.length, "</h2>",
    j.join("<br />")
);

//+ Jonas Raoni Soares Silva
//@ http://jsfromhell.com/array/permute [v1.0]

permute = function(v, m){ //v1.0
    for(var p = -1, j, k, f, r, l = v.length, q = 1, i = l + 1; --i; q *= i);
    for(x = [new Array(l), new Array(l), new Array(l), new Array(l)], j = q, k = l + 1, i = -1;
        ++i < l; x[2][i] = i, x[1][i] = x[0][i] = j /= --k);
    for(r = new Array(q); ++p < q;)
        for(r[p] = new Array(l), i = -1; ++i < l; !--x[1][i] && (x[1][i] = x[0][i],
            x[2][i] = (x[2][i] + 1) % l), r[p][i] = m ? x[3][i] : v[x[3][i]])
            for(x[3][i] = x[2][i], f = 0; !f; f = !f)
                for(j = i; j; x[3][--j] == x[2][i] && (x[3][i] = x[2][i] = (x[2][i] + 1) % l, f = 1));
    return r;
};

var a = ["A", "B", "C", "D"], q = 3, j = simpleArrange(a, q);
document.write(
    "<h2>", a.join(" - "), " : ", q, " = ", j.length, "</h2>",
    j.join("<br />")
);

//+ Jonas Raoni Soares Silva
//@ http://jsfromhell.com/array/simple-arrange [v1.0]

simpleArrange = function(a, n, m){ //v1.0
    var o = a;
    if(n >= o.length) return [];
    for(var j, l, k, p, f, r, q = k = 1, i = (l = o.length) + 1, j = l - n; --i; i <= j ? q *= i : k *= i);
    for(x = [new Array(n), new Array(n), new Array(n), new Array(n)], j = q = k * q / q, k = l + 1, i = -1;
        ++i < n; x[2][i] = i, x[1][i] = x[0][i] = j /= --k);
    for(r = new Array(q), p = -1; ++p < q;)
        for(r[p] = new Array(n), i = -1; ++i < n; !--x[1][i] && (x[1][i] = x[0][i],
            x[2][i] = (x[2][i] + 1) % l), r[p][i] = m ? x[3][i] : o[x[3][i]])
            for(x[3][i] = x[2][i], f = 0; !f; f = !f)
                for(j = i; j;)
                    if(x[3][--j] == x[2][i]){
                        x[3][i] = x[2][i] = (x[2][i] + ++f) % l;
                        break;
                    }
    return r;
};

//+ 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;
};

document.write( arrange( ["A", "B", "C" ], 3, 1 ).join( "<br />" ), "<hr />" );
document.write( arrange( ["A", "B", "C" ], 3, 0 ).join( "<br />" ) );

//+ 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;
};

document.write( permute( ["A", "B", "C" ], 1 ).join( "<br />" ), "<hr />" );
document.write( permute( ["A", "B", "C" ], 0 ).join( "<br />" ) );