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Originally I had it as, the error was that c was undefined.

constructor(c){
        this.x = c.x || 0;
        this.y = c.y || 0;
        ...
}

I tried doing this as well (as suggested by the answer to this question), the error is that the values always get set to default.

constructor({
        x = 0,
        y = 0
        } = {}){
        this.x = x;
        this.y = y;
        ...
}

Link to Github repo

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  • So you need to test if c is an object before you read its property Question is, why would you pass in undefined to it and not with a default empty object. Commented Sep 2, 2021 at 0:23
  • this.x = c?.x || 0; or set a default for c Commented Sep 2, 2021 at 0:25
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