How to save my block code with variables?

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user110706
The reason why I use validate is, when I don't choose any value in dropdown, so the default value should be set, but unfortunately it doesn't. The value was undefined when I don't select any value in dropdown!
```
if(motorValid_ === false) {
        motor_ = 0;  <-----------------------  here because motorValid never got set
    }
    else {
        motor_ = block.getFieldValue("turnMotor_") <--- never gets called
```
So that block.getFieldValue("turnMotor_") line works well, because of validator.

I can't think the way that just check what's going on when creating the code in Blockly.JavaScript.*.

Can you explain with any examples?

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