Custom block Code

[lili loula]

  Hi,so  im currently working on creating custom movement  blocks  like moveforward() and movleft() in order to animate caracter like the maze game from blockly so i created the blocks but when it comes to generating the code i want my caracter to move so i did this but i dont know if that is the right approche or i have to return  the string code like where should i put the animation javascript function :

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//this is the block definition

  Blockly.Blocks.moveBackward = {

      init() {

        this.appendDummyInput().appendField('MoveBackward');

        this.setInputsInline(false);

        this.setPreviousStatement(true, null);

        this.setNextStatement(true, null);

        this.setColour(290);

        this.setTooltip('');

        this.setHelpUrl('');

      },

    };

//this is the animation function i want to execute when the move block is draged

 moveBackward() {

player.setVelocityX(-150);

player.play("walk")

  }

//and here's the block code generator 

((Blockly as any).JavaScript['moveBackward'] = function (block) {

    // TODO: Assemble JavaScript into code variable.

    var code = moveBackward();

    return code;

  });

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So is it right what im doing or  should i return string instead of moveBackward() function and where should i place my function ,please help me ,thank youu