[javascript] Parse JSON String into a Particular Object Prototype in JavaScript

I like adding an optional argument to the constructor and calling Object.assign(this, obj), then handling any properties that are objects or arrays of objects themselves:

constructor(obj) {
    if (obj != null) {
        Object.assign(this, obj);
        if (this.ingredients != null) {
            this.ingredients = this.ingredients.map(x => new Ingredient(x));
        }
    }
}

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