Move Ordering in Javascript Chess Engine chess.js

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i am by far a javascript specialist but i am trying to learn it a little.

For the move ordering in my chess engine (i follow a tutorial), i would like to check for captures first.
In the chess.js library the capture moves are listed with the flag ‘c’.

game.moves({ flags: 'c', verbose: true })

so im trying to make a shopping list with first the capture moves, and after that, all the rest moves.
i tried it like this:

var children = [                                                                    
    [game.ugly_moves({ flags: 'c', verbose: true })],
    [game.ugly_moves({ verbose: true })]
];

like this:

var children = [game.ugly_moves({ flags: 'c', verbose: true })] + [game.ugly_moves({ verbose: true })];

But nothing seems to work.

My code can be seen at http://users.telenet.be/gianc/chessai/js/main.js at line 153

other info: https://github.com/jhlywa/chess.js/blob/master/README.md

Any input is greatly appreciated!

TIA

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