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[tutorial errata] #571

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@warren-bank

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@warren-bank
  1. Part 1 / Stores / Store bindings
    • tutorial
    • git
    • comments:
      • following:
        • The $name += '!' assignment is equivalent to name.set($name + '!').
      • addition:
        1. a note that this is also equivalent to:
          name.update(n => n + '!')
        2. a note about whether this is also equivalent to:
          name.update($name => $name + '!')
          • does $name have any special meaning in this context,
            or can it be used (for readability) as the name of this parameter?
        3. a note about whether there is any performance benefit in choosing one form vs. another

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